It varies between programs. A lot of programs ask you to tell them a little about yourself. They will ask you about where you grew up and went to school. They also like to ask you about your future plans after you finish residency. And many of them ask why you picked this particular specialty or residency program.
Sometimes, programs will ask you a few clinical questions, so you should be prepared for those. And occasionally a program will ask you, "What can you do for this program if we accept you?" So be sure that you have an answer to that particular question.
I also interviewed at one program where they didn't really ask us many questions about ourselves. It was more like, did we have any questions about the program. So residency program interviews often vary in the types of questions asked.