No, this is not an illegal question nor is it meant to be discriminatory.  Mostly, the interviewer is trying to find out if you have common interests or something that can always be common ground between the two of you.  It is also a way for the interviewer to gage your personality and possible contributions you could make.

Give specific answers and paint a picture much like you would with any other question you are being asked during the process.  Explain why…