They ask you questions based on your resume. Then they ask you a personal question. I am not sure the full range of questions they offer. Overall, though, it's a pretty relaxed experience. If you stay calm and "ping pong" questions back, you should be perfectly fine.

Interview was about 15 minutes. Interviewer kept repeating that they did not have space for many interns this year due to Harvey flooding. Barely asked me any questions and seemed disinterested. Learned after that the interviewer had offered my classmate on the spot, BEFORE my interview ever occurred. Terribly unprofessional to waste someone’s time in this way.