This is interview question about your career goals. What the interviewer really wants is to see that you’ve thought about your future, and gauge your ambition. They also want to verify that this isn’t just a stop gap position.
Although all of your answers should be tailored to the organization and position you’ve applied for, this is especially the case with this question. If you’re going for an entry level position, for example, explain how you’d like your career to progress (e.g. ‘I’d like to progress to a Senior Software Engineer’ or ‘I see myself being a team leader…’).
If you’re going for a more senior position, explain how you’d be looking to move the company forward. Have a look at their business strategy or corporate objectives before the interview, and explain how you can help in achieving them.