A Ph.D. (Doctor of Philosophy) is the highest academic degree you can earn in most fields. To apply for a PhD, you usually need to have a master’s degree in a related subject, although in some cases, students with a 4-year undergraduate degree or those who have cleared NET/JRF or GATE can also apply. The PhD program involves deep research , writing a thesis or dissertation , and working closely with a guide or supervisor. It can take 3 to 6 years to complete. Most universities in India conduct entrance exams and interviews for PhD admissions. It’s ideal for those who want to become researchers, professors, or experts in their field.