Use a simple three-part structure
Where you're from academically — your course, specialisation and anything genuinely relevant to the role. What you've done with it — a project, internship or achievement that shows initiative, not just a list of subjects. Where you're headed — why this role or company, specifically, not a generic "I want to grow." Thirty to forty-five seconds covers all three without rambling.
Lead with what's relevant to the job, not your life story
Interviewers aren't asking for a biography. If you're interviewing for a technical role, lead with a relevant project before your hobbies. Save the personal details — where you grew up, your family — for later in the conversation if they come up naturally.
Practise it out loud, not just in your head
An introduction that sounds fine in your head often comes out hesitant or over-long when actually spoken, because speaking uses a different kind of fluency than thinking. Say it out loud, to another person, several times before the interview — ideally to someone who'll interrupt with a follow-up question, since real interviews rarely let you finish uninterrupted.
Avoid memorising it word for word
A memorised answer sounds memorised, and it falls apart the moment an interviewer asks a slightly different question. Know your three points cold, but let the exact words vary each time you say them — that's what makes it sound like you, not a script.