This can be a killer question and can make or break your chances of winning the job. And how you answer will depend on how well you have probed your interviewer about their requirements and expectations. So what the interviewer is really asking you is, What can you do for my business? Your response needs to answer that question.

For example:

As I understand your needs, you are first and foremost looking for someone who can increase your advertising sales and has experience of managing a sales team. I have a proven track record in successfully managing and developing my territory within this sector, having increased my sales from £150,000 to £210,000 over the last two years alone.