This may be considered the toughest question of an entire interview. The challenge of this question is that internship and job applicants don't know where to start when answering. Knowing what to include when answering a question of this nature is half the battle. The important thing is to focus on key skills, interests, and accomplishments that will help you shine as a potential candidate.
The truth is that the answer to this question can set the whole tone of the interview. By practicing you will be able to begin the interview on a positive note. Since it's the first and last 60 seconds that count most in an interview, preparing to answer this question can provide a definite advantage from the start.