The interviewer wants to understand more about your career goals and how this position would fit into your grand plan. They care about your career goals because they want to hire someone who is motivated, proactive, and likely to stick around and work hard if hired. You need to demonstrate your enthusiasm for the job as an exciting next step for you. Most importantly, make it clear that you are motivated to take on this opportunity right now. And preparing for this question is a very good exercise in figuring out what you enjoy doing, what is meaningful to you, and really what you actually want to be doing in five years.This could help you focus your job search, in addition to providing a good answer to a common job interview question.