A PhD (Doctor of Philosophy) is the highest academic degree awarded for original research. In India, a PhD typically takes 3 to 6 years to complete, depending on the discipline and the research scope. In countries like the USA or UK, it may take 4 to 7 years. The duration includes coursework (if required), comprehensive exams, proposal development, research, and thesis submission. Some programs may extend due to fieldwork or revisions. A PhD opens doors to academic, research, and high-level professional careers across disciplines.