What your interviewer is looking for

"Tell me about yourself" doesn’t mean “give me your complete history from birth until today.”  It doesn’t even mean “walk me through your work history.” It means “give me a brief overview of who you are as a professional.”

Interviewers who ask this question are generally looking to get a broad overview of how you see yourself, as a sort of introduction or an icebreaker before starting to dive into the specifics.