The interviewer is trying to list your strengths and weaknesses to decide whether you can do the job and have the right attributes
The interviewer wants to know how much information you have found out regarding the company, its history, ethos, market share and plans.
The interviewer wants to ascertain how much you really know about the position and that you have done your research in finding out.
The interviewer wants to know what your previous experience has been and how relevant this is to the their vacancy role.
The interviewer wants to know if you would be effective working in a team rather than on your own and how you interact with others.
The interviewer wants to know if you’re keen enough to have researched their products and services in advance.