Hi Saranya !

The difference between information systems and information technology is that the first focuses on the need to know systems and analysis, and it is the process of planning or converting systems in various forms, whether computer or ordinary or administrative information and systems that are easy to deal with, Which is established as a financial reporting, and find answers to questions and visions of the future, and the information technology focuses on technology, and the technical use of the results of the analysis of the information organizer and applied to the available hands of technology Or technical matters.

Hey!
Information Technology (IT) is designed to teach students about various fundamental concepts of information security, web systems, computer networking and software engineering. IT covers subjects like programming, mathematics, and operations among others. Information technology can also  be defined as the study, design, implementation, support of computer-based information systems. IT typically includes hardware, software, databases and networks.
Information Science (IS) and Engineering is a discipline which includes theories, standards, methods and innovations of various different domains like mathematics, complex  science, information theory, etc to solve the complex IT problems. Information Science and Engineering focuses on collection, categorizations, strategizing, and storage of information as well how to analyze and interpret the raw data.
Check the below link for more Information
https://engineering.careers360.com/articles/information-science-engineering-0
Hope this helps
All the best !