List of Online Courses and Certifications

The ‘Combinatorics’ online certification course is created for the students to engage and discuss the various aspects of counting and the study of patterns in this course. The students of this course will engage in enhancing their knowledge of mathematics and algebra. The free online learning course is provided by Swayam in collaboration with the National Program for Technology Enhanced Learning (NPTEL). The classes for this program are conducted online aided by lectures, videos, books, and reference materials for about twelve weeks.

The instructor for this program is Prof. Narayanan N from the department of physics at the Indian Institute of Technology Madras. The students of this undergraduate level mathematics and algebra course will gain insights into the concepts of combinatorics.

The ‘Combinatorics’ online training program equips students with the E-Certificate and credits points after successfully completing this core course approved by the All India Council for Technical Education. The students are evaluated based on their weekly assignments and final examination for the certification.

SageMath is a python based, free and open-source computer algebra system (CAS). The software is being used widely to explore applied linear algebra, calculus, and numerical methods. The Computational Mathematics with SageMath course by Swayam aims to deep dive give practical learning to the applications of SageMath in the concepts mentioned earlier.

The Computational Mathematics with SageMath certification syllabus covers a range of topics like python, classes in python, use of NumPy, SciPy, and SymPy, exploring SageMath, local maximum and minimum, and the like. The AICTE verified course is perfectly suited to students wishing to pursue their careers in the data science or numerical computations industry.

Besides, the Computational Mathematics with SageMath online course is taught by an experienced professor from chemical technology, Mumbai, called Prof. Ajit Kumar. The 12-week course will contain weekly assignments for evaluation through which the students will be able to track their progress.

An invitation to Topology certification by IMSC via Swayam is a 12-week online course. Through this online certification course, students will be exposed to the investigation and formalization of the abstract notion of a “space” under a minimum set-theoretic structure, known as a topology. An invitation to Topology certification syllabus provides foundational theory in topology which plays a crucial role in modern mathematics, and by extension, other mathematical sciences. This is a free course and anyone interested in learning topology can enrol in this online course offered by the Institute of Mathematical Sciences, Chennai (IMSC) via Swayam. 

Spread across 12 weeks, An invitation to Topology online course equips learners with the concepts of Topological spaces, Subspace Topology, Box and Product topology, and Metric topology. The course also provides a certificate on the completion of the exam which is conducted at the designated exam centres.

The Advanced Thermodynamics online program is developed by the Indian Institute of Technology, Guwahati. The course aims to impart high-quality knowledge on advanced concepts in Thermodynamics such as fugacity of solids and liquids, intermolecular forces between nonpolar and polar molecules, virial coefficients, Raoult’s law, Gibbs energy, thermodynamic consistency, NRTL equation, phase behavior of solid solutions, etc.

There are many cases of liquid-liquid, solid-liquid, vapor-liquid, and vapor-liquid-liquid equilibria in chemical engineering procedures. Assumptions of binary systems and ideal behavior are used to approach these cases; however, multi-component mixtures and non-ideality prevail in actuality. So, the Advanced Thermodynamics online course provides a step-wise understanding of the thermodynamics characteristics to deal with such equilibrium cases.

This 12-weeks-long online program is designed to help you learn the methods of solving problems connected to non-ideality in LLE, SLE, VLE, and VLLE for multi-component mixtures.

CIT-001: Fundamentals of Computer Systems course covers the basic working of a personal computer and introduces a wide range of software tools. You will gain fluency in the implementation of numerous devices such as I/O and storage devices. These technologies and ICT tools are quite helpful as they can be used in everyday life, and mastering them will allow you to become an enhanced professional.

You will study the concepts of problem-solving with SWAYAM’S CIT-001: Fundamentals of Computer Systems programme and use the element of logic to solve various problems. Moreover, the curriculum will also introduce you to elementary programming concepts using the C language. In this manner, the course takers learn several problem-solving techniques.

Take this course to familiarize yourself with networking devices and the working of Computer Systems to use these tools confidently and establish a firm career path by achieving expertise.

The ‘Appreciating Linguistics: A typological approach’ online course is developed for the students to study the language forms and functions, the process of language acquisition, and the description of natural language. This course will focus on the different languages and their linguistic attributes along with the grammatical implications. This free online certification course is provided by the Swayam online portal in association with the National Program for Technology Enhanced Learning (NPTEL).

The course instructor for this online program is Prof. Anindita Sahoo teaching linguistics at the Indian Institute of Technology Madras. The elective program for the undergraduate level students is categorized under the humanities and social sciences domain and enables the students to gain a comprehensive understanding of the concepts through the online classes aided by videos, lectures, and other online resources.

The ‘Appreciating Linguistics: A typological approach’ online certification course offers the students the course certification with credit points after successfully completing the program according to the qualifying standards.

The ‘American Literature & Culture’ online course is developed for the students to discuss and study American literature and the important social and cultural movements in American studies. The students of this course will get introduced to the eminent poets and writers of American literature. The online National Program on Technology Enhanced Learning(NPTEL) training program is provided by Swayam, a free online education portal initiated by the Government of India. 

This online training is scheduled for a period of twelve weeks in this elective program for the postgraduate level students of the fields of humanities and social sciences, and English Studies.

The course instructor for this online program is Prof. Aysha Iqbal Viswamohan faculty of film studies, drama, and popular culture at the Indian Institute of Technology Madras. The learners during the course of study in this program will develop a comprehensive understanding of the literary significance of American literature. 

The ‘American Literature & Culture’ certification course helps students get an E-certificate that can be downloaded and credit points at the end of this All India Council for Technical Education(AICTE) approved course.

Swayam’s MSD-011 Sustainability Science course is focused on the principles and genesis of Sustainability Science and its structure, central elements, goals, and growth. This course has been developed by Indira Gandhi National Open University (IGNOU), and it is carefully designed to emphasize the importance of sustainable development.

MSD-011 Sustainability Science course also discusses the concepts of Natural Resource Management at the landscape level and Evergreen Revolution as effective routes to achieving Sustainable Development Goals (SDGs) by 2030. With the help of Indian examples, you will understand the concept and evolution of sustainable development and sustainability indicators.

Besides, the MSD-011 Sustainability Science course by Swayam has an extensive curriculum spread over 12 weeks. Learn about the powerful relationship between humans and the environment and how their interactions affect sustainability with the help of this post-graduate level course and display your knowledge.

The Yoga Practices 1 training course is a 12 weeks online course. It offers holistic, practical, and theoretical knowledge about yoga. Even though the course is designed for beginners, it is equally useful to other yoga practitioners as it contains salient practices. Dr Vikas Rawal will deliver this beginner-level course.  

The Yoga Practices 1 certification by Swayam consists of intensive video directions and learning from the instruction manual. It also involves meditation, asanas, mudras, kriyas, and much more. The key feature of this course is that it uses the eight-step learning methodology for each asana and helps thoroughly embed the acquired knowledge.

The Yoga Practices 1 certification begins with preparatory practices and progresses with various breathing exercises, loosening practices, and sun salutation. These practices will guide the learner’s personality and help it develop from Tamas to Rajas to Sattva, and eventually to Gunathita, i.e. attainment. Take a step towards a healthy and calm life with the Yoga Practices 1 online course.

Physiology and Biochemistry course has been intended for the students concentrating on the subject of zoology at school or college level according to the UGC approved educational program. The course will cover the basic parts of physiology and biochemistry including introduction, the foundation of degree and history of both aspects. Moreover, this course can likewise be selected by undergraduates of other branches of biological science.

Physiology is the part of science that manages the typical elements of living life forms and their parts. Biochemistry is the part of science which is worried about the substance and physicochemical cycles that happen inside living life forms. Physiology and biochemistry both are the significant parts of science which have their own importance in different fields including paramedical, medical, toxicology, cardiology, pharmacy, and many more.

Physiology itself contains a huge number of branches, for example, blood physiology, renal physiology, regenerative physiology, neural physiology, muscle physiology and so on, and these all branches extraordinarily centres around how these organs work in a joint effort with one another.

Biochemistry causes us to comprehend our catalysts, particularly how they work? What are they composed of? Why do we feel hungry? Why do we take in glucose when we feel frail? Why do we feel tragic? It likewise helps in the conclusion of breaking down of body frameworks by giving diverse biochemical tests that can quantify our body liquids and components and gives us the clue to keep up these pivotal components in their ideal level.

Macroeconomics is a branch of economics which deals with the analysis of performance, structure, decision-making and behavior of an economy as a whole, including regional, national and global economies.

This Macro Economics course by Swayam aims to teach the student the basic concepts of macroeconomics, raise awareness about aspects of money and banking, gain ample information on various concepts of macroeconomics and operations of monetary and fiscal policy.

The course also hopes that the student develops awareness about the causes and effects of certain macroeconomics concepts while working under an economy such as inflation, supply/demand of money and so on.

In this sector, the studies are conducted to determine and explain relationships between factors such as income, output, inflation, unemployment, government spending, consumption and international trade. The field also deals with the study of aggregated indicators such as GDP (Gross Domestic Product), price indices and unemployment rates in order to understand the country’s condition and the scope to how much it can be improved.

The Macro Economics course by Swayam will teach students how to apply these concepts in both their professional and personal lives and help them gain success in such a highly competitive environment.

The ‘Introductory Neuroscience & Neuro-Instrumentation’ online course is a design-based program offered in the Swayam portal which is an initiative by the ministry of education in India. This faculty development program approved by the AICTE is developed and provided by the National Program for Technology Enhanced Learning in collaboration with the Indian Institute of Science(IISC) in Bangalore. The course study is focused on the design aspects and implementations of neuroscience in our day-to-day lives.

The program is conducted for a period of twelve weeks by the course instructor from the center for Bio-systems science and engineering in IISC, Dr. Mahesh Jayachandra is the facility technology manager in neurophysiology. This is an elective course and developed as a part of the electrical, electronics, and communication engineering domain.

The students of the ‘Introductory Neuroscience & Neuro-Instrumentation’ training program will gain three credit points and receive a course certificate that contains the NPTEL and IISC logo making it E-Verifiable.

The online program in Antennas by Swayam primarily focuses on helping learners gain an in-depth understanding of Antennas and their varying types. These include the Monopole, Slot, Loop, Dipole, Reflector, Horn, Helical, Log-Periodic, Yagi-Uda, Microstrip, Linear, Planar, MSA Antennas. The course curriculum also comprises robust support from the space organization, telecom industry, and defense industry.

This 12-week elective training in the ‘Communications Engineering, Electronics, and Electrical’ category focus on undergraduates and postgraduates. The Antennas certification syllabus imparts impeccable knowledge about core areas such as the various Antenna types, IE3D Session TA, MSA Arrays, Circular MSAs, and MSA Parametric Analysis. The curriculum also offers a term-end lab session for students to experience hands-on skills.

While the AICTE-approved Antennas program is free-to-learn, candidates can opt to register for Swayam’s proctored assessment to earn the e-verified certificate. To do so, they must clear the specific criteria to pass the examination. Once they do, aspirants will receive the valuable certification, carrying IIT Bombay and NPTEL’s logos to verify their learned skills. 

The ‘Fabrication Techniques for MEMs-based sensors: clinical perspective’ online course is provided on the online education portal, Swayam by the ministry of education in India. This course is a faculty development program accredited by the AICTE and is developed and offered by the National Program for Technology Enhanced Learning(NPTEL) in partnership with the Indian Institute of Science(IISC), Bangalore.

The fabrication techniques program is an elective course that is scheduled for a period of twelve weeks and is part of the electrical, electronics, and communications engineering domain. The students of this course will get an opportunity to explore the aspects of fabrication and microengineering. The course instructor for this undergraduate-level training program is Prof. Hardik Jeetendra Pandya from the department of electronics systems engineering in the division of electrical sciences. 

In this course, the students will gain an experiential understanding of the techniques and principles while also receiving the three credit points and the Swayam course certificate that consists of the logos of NPTEL and IISC.

With the breakthrough of this huge pandemic, countries have suffered a major economic setback. Taking away the jobs of millions of people. In order to counter this present scenario, entrepreneurs are the need of the hour. Starting a new business might seem difficult and sometimes an impossible task but with the correct guidance, it’s everyone’s cup of tea! 

Yes, You heard that right. Gone are the days when Entrepreneurs were born. Today, we create them. 

Swayam’s Entrepreneurship Development Course aims to develop entrepreneurial abilities in you by providing you with the right and up to date data regarding entrepreneurship. Whether it is starting your own start-up or managing a family-owned business, you can do it all with our solid introduction of Entrepreneurial processes. This course will help you hone your skills in creativity and innovation, as well as managing the stress and pressure Entrepreneurs go through.

This course is the first step towards a bright and self-owned life for those who plan to start their own business or carry forward a family-owned company.

Experimental Physics I Certification is a core course at the undergraduate level, which is offered online. It belongs to the category of Physics. The course will help students understand the working principle of common devices, their applications in different types of experiments. The course is also ideal for students who are preparing for GATE, NET, JAM, and JEST exams conducted by reputed institutes. There are three modules in the course and each module is 30 hours. 

Prof. Amal Kumar Das is the instructor for Experimental Physics I Certification course on the NPTEL website. Prof. Amal Kumar Das has a PhD in material science and experimental physics from the Institute of Physics, at Bhubaneswar. Each module is a 30 hours course. Currently, only module – I is discussed in this online course. Modules - II and III may be discussed in upcoming semesters. 

The Waves and Oscillations course is designed to help candidates understand one of the most important concepts in physics, waves, and oscillations. The course gives insights into how this theory can be applied to understand how specific applications like communication gadgets, musical instruments, and other electronic devices work. 

The Waves and Oscillations certification course emphasises the current trends and practices of why and how devices rely on this concept. The course also deep dives into different aspects of wave phenomenon. Furthermore, the method of teaching is not only theoretical. Candidates will gain in-depth insights into the practical application of the theory as well. 

Moreover, Professor M S Santhanam from the prestigious IISER, who has conducted various researches on the same, teaches the Waves and Oscillations online programme. The course is perfect for students who want to specialise in Physics as it will help you to evolve your thinking about the concept of waves and oscillations and their future uses. 

Access, Equity, and Quality are the three building blocks of the Indian Education Policy. The foundation of ‘Swayam’ has been solely laid for the purpose of attainment of all the three principles through its Platform for free, to aid in the learning of school-dropouts or professionals or those with financial and economical disadvantages, from Class 9 level up to even Post-Graduation.

Keeping in mind the unavailability of Physical Resources, economical shortcomings and lack of an adequate platform, the Government has employed more than thousands of learned faculties, specially appointed for the job and is constantly making efforts to make the candidates digitally educated.

The programme is named ‘Swayam’ symbolising the process of self-learning and self-efficient nature of the initiative. The programme aims to bridge the digital gap among the digitally unhinged masses of students and technology itself. Even those who’re underprivileged and deprived of digital exposure and knowledge can pursue the Political Ideologies Certification programme from their home and fulfil their educational requirements.

The course has four different methods included in its teaching- learning dynamic to strengthen the understanding of the candidate and to ensure a complete understanding. The four methods are- Video Lectures, Doubt-solving Forum, Digital Reading Material, and Tests and Quizzes for practice.

National Coordinators like NCERT, IGNOU, NIOS, AICTE, NPTEL CEC, UGC, IIMB, and NITTTR are responsible for evaluating the standards and process of education being provided by Swayam. The main goal is to give Higher Education its due importance.

The Indian Government and Politics course being offered by Swayam is a core course in B.A. Political Science under the Choice Based Credit System (CBCS). This course has been designed to provide the learner's knowledge and understanding about the functional, philosophical and theoretical aspects of the Indian Politics. 

The course will give an in-sight into the diverse perspectives regarding the Indian Political System along with the Social movements and constitutional provisions. Participants of the course will be given a detailed understanding of the fundamentals of Indian Political System from varied perspectives, the philosophical basis of our Indian Constitution, implementation of the Directive Principles of State Policy and Fundamental Rights as given in the Constitution, Institutional composition and functions of Indian Polity, Social concerns in India and Political approaches towards them, Political Economy of our State and the nature and impetus of the various social movements in India.

The ‘Classical Sociological Theory’ online training program is offered for the students to build their expertise in the field of sociology. This course helps the students develop sociological views and enables them to learn about the socio-cultural and intellectual factors that frame the foundation of sociology. This is an AICTE approved free course provided by Swayam along with the National Program for Technology Enhanced Learning(NPTEL) initiative. 

The duration of this online core course is scheduled for a period of twelve weeks and the students of this program will benefit from the sociological insights. The instructor for this course is Dr. R. Santhosh, professor of sociology from the humanities and social sciences department at the Indian Institute of Technology Madras. 

The ‘Classical Sociological Theory’ online course helps the participants receive a course certification with credit points at the end of the course. The learners of this course are provided with online resources and materials for better engagement with the concepts and subject matter.

The main objective of the course of Fundamentals of Rural Sociology and Educational Psychology is to improve the conditions and techniques used by our farmers in agricultural practices. The study can be quite complicated since the candidates have to be well-versed with the culture, value system, and social structure of the rural areas before beginning to work. The course provided by Swayam is here to cater to these needs. 

The course consists of 40 modules, having 4 credits. The course in total has 4 units, which is almost 13 to 15 hours of extensive study. The course is further divided into 4 quadrants, having their own study materials. Taking up this course and being under the guidance of our skilled and experienced faculty will equip you with the skills required to uplift the current rural agricultural systems as well as increase the scope of the better well-being of the farmers in the rural areas. 

By taking the Proficiency Course in Spanish, you will be able to demonstrate basic listening and oral comprehension skills. Also, you will be able to practice conversations on familiar topics, listen to simple audio texts, and understand necessary information and instructions. 

Additionally, the Spanish Proficiency programme will help you respond to questions on personal information and address the same - age, name, profession, and nationality. You will be equipped with the necessary writing, and reading skills not just to form simple sentences, but also question the other person.

The Spanish Proficiency online course is a core language course offered at an Undergraduate level with various objective assignments. This 12-week course includes subjects ranging from basic grammar and sentence formations to studies of Hispanic cultures and laureates. Moreover, Dr. T. Srivani will teach the course. She is a Gold Medallist in MA Linguistics from Osmania University and has done her M.A in Hispanic Studies from the University of Delhi. 

The Introduction to Robotics program is developed by IIT Kanpur. It explores the concepts and mathematical calculations that go behind building robotic manipulators. This introductory course lays a foundation in advanced topics such as AI, automation, self-driving vehicles, and much more. Concepts studied include kinematics, VAL programming, automation, trajectory planning, and vectors.

The Introduction to Robotics certification syllabus uses video lectures, book references, a final assessment to facilitate learning. Learners must be familiar with mathematics, differential equations, and matrices- all on a fundamental level. This AICTE approved course is best suited for undergraduate and postgraduate-level electrical, mechanical, and computer students. 

Engineering teachers and working professionals may also apply as this elective course is an FDP (Faculty Development Program). Candidates can opt for the Introduction to Robotics certification by securing the minimum marks as mentioned. For this, they need to complete the course, submit assignments, and write the final-term proctored test.

Swayam’s BSW-41: Understanding Tribals online programme is a core diploma-level course and falls under the humanities and social sciences category. It is a four-credit, 12 weeks long curriculum, designed and organised by experts in the field, and will be instructed by Dr N. Ramya.

The BSW-41: Understanding Tribals course structure comprises 12 units which are divided into three blocks. It involves in-depth information about the evolution of tribal studies concerning India, including the study of Indian as well as international tribal communities. 

The programme will help you attain fluency in the numerous areas related to tribals such as evolution, perception, tribal territories, constitutional provisions for tribals, international conventions, tribal education, healthcare, nutrition, and much more.

Swayam uses renowned national coordinators such as AICTE, NCERT, UGC, IIMB, IGNOU, etc. to cross check their course material and revise it to the standards of any university course across India. As a result of this, the BSW-41: Understanding Tribals diploma programme’s credits are transferable and have the advantage of being verified by a Government-initiated body.

The NBA Accreditation And Teaching - Learning In Engineering (NATE) training provide a postgraduate level of programme. The programme covers topics related to the NBA's guidelines regarding accreditation and teaching in the field of engineering. The course includes topics like OBE and accreditation, course designs and outcomes, surveys, etc. The course is designed for aspiring engineering faculty.  It includes 12 different chapters that will be dealt with over a time period of 3 months. The NBA Accreditation And Teaching - Learning In Engineering (NATE) certification syllabus will be taught by two different professors who are faculty members of IISc and MSRIT, Bangalore.

The course is provided by IISc, Bangalore and an e-certificate will be provided to the students if they choose to qualify for the proctored exam which will be conducted at the end of the programme. The course will be provided with study material. The NBA Accreditation And Teaching - Learning In Engineering (NATE) certification course is completely a free online learning experience which can be pursued according to the schedule of the student. Candidates are free to take time to decide about joining the course since there is no last date to apply for the course. Students can join the NBA Accreditation And Teaching - Learning In Engineering (NATE) programme as per their requirements. 

Design and Facilitation of E-Learning Course’s layout are made keeping in mind the welfare of the teachers, students, and practitioners of the e-learning system. The design facets of Instructional design are built according to the need of the aspiring learners so that they can acquaint them easily. This course will cover the methods, techniques, and skills which are required to design useful e-learning solutions. 

The candidate will learn about theories, principles, etc which are in use presently. Acquire firm knowledge to design effective e-learning interactions which help in increasing the learning capability and prove helpful in cost-cutting as well.

Swayam Design and Facilitation of E-Learning Course is an apt course for learners seeking an efficient teaching education. The course time duration is 12 weeks.

This course can be taken up by individuals looking to build a career in either the teaching firm or as an instructional designer. The candidates will get to learn from video programs, through informative web sources, ppt/pdf contents, and also from teacher interaction.

Swayam charges no fee to enrol or study the Design and Facilitation of E-Learning Course, but to acquire the certificate, the learner is mandatorily required to pay the certification fee and appear in the offline examination being conducted at an exam center.

The goal of ICT Skills in Education Certification is to provide you with a comprehensive understanding of technologies and how they can be used in the teaching-learning process. We will also talk about the idea of ICTs, their uses in education, and how to educate students about these tools. 

The learner will gain a thorough awareness of what is occurring to various ICT components globally through ICT Skills in Education Classes. The ICT Skills in Education Certification Syllabus is meant to help students develop a critical awareness of the numerous problems with ICT integration in the classroom.

All students get a ICT Skills in Education Certification by Mahatma Gandhi University, Kottayam under the Swayam Initiative by the Government of India. 

Planning, time management, effective communication, resourcefulness and leadership are some of the high value practical and social skills that educators need to possess. Assessment of Practical and Social Skills in Higher Education programme aims to enhance teachers’ capabilities and skills to evaluate better and provide valuable feedback to their students. 

Assessment of Practical and Social Skills in Higher Education syllabus focuses on psycho motor and effective domain-related skills. It will help you aid and nurture positive development in students and instil confidence in your employers. The course will be taught by esteemed educators from the National Institute of Technical Teachers’ Training and Research, Bhopal. 

Assessment of Practical and Social Skills in Higher Education is a twelve-week course in Continuing Education. This AICTE approved course is also an ARPIT course, also known as the Annual Refresher Programme in Teaching. There is an extensive list of books and references offered on the course page to help you gain a comprehensive understanding of the curriculum. 

The coronavirus lockdown caused a sudden shift of education to the online mode, due to the closing up of educational institutions. This also affected learning and teaching methods, student assessments and exams. However, the online mode of teaching is here to stay as it has opened up greater opportunities. The Online Teaching: Creating Courses for Adult Learners microcredential gives training in how to create engaging online courses for adults.

This Microcredential in Online Teaching: Creating Courses for Adult Learners is offered by Future Learn and created by The Open University, UK. The expert instructors in this course will offer their knowledge to teach you the various new technologies and methodologies that you can use to teach online. You will learn to incorporate these skills to make your classes accessible and inclusive.

The Online Teaching: Creating Courses for Adult Learners online course will help you to develop online learning activities and assessments. This is a 12-week-long course of the postgraduate-level. It also offers projects and assessments, and is worth 15 university credits. Using this professional certification, you can advance your career and ensure personal growth.

Although the use of technology in education isn’t new, the coronavirus pandemic has accelerated our reliance on it at an unprecedented rate. Using Online Teaching: Evaluating and Improving Courses programme, instructors can upgrade their teaching techniques through Technology-Enhanced Learning (TEL). This course will be useful for trainers in any sector, working individually or with an organisation.

This course in Online Teaching: Evaluating and Improving Courses by Future Learn will help you to design course evaluation frameworks, analyse the cause-effect relationships, and make learning and assessments better for your students. It will enhance your online teaching skills and help you and your students make a smoother transition to education in the online mode.

The Online Teaching: Evaluating and Improving Courses Microcredential is developed by distance teaching experts at the Open University, UK. As such, the course has a lot of real-life value and provides immeasurable skills. The course also awards 15 credits to the learners, a certificate and is a postgraduate-level course.