A PhD is a postgraduate research degree that involves original research presented in a thesis and oral defense. It typically takes 3 years full-time to complete in the UK, and up to 5 years elsewhere. After a PhD, about 50% of graduates pursue further academic research careers, starting with a series of postdoctoral positions. When choosing a PhD program, students should select a research project they are passionate about and check the publication record and citations of potential supervisors. Funding for PhD studies comes from research councils or university bursaries in the UK, and teaching or research assistant positions in other countries. The application process involves standard forms, references, a research proposal, and interviews where applicants must demonstrate their preparation and interest in