This question is asked to understand the strengths you have that will match the strengths that the interviewers are looking for. Also when you mention your weaknesses it talks about your honesty. The employer wants to know if you are working on your weaknesses. When you talk about your weaknesses make sure to tell them how you are trying to work on it too. See to it that the answer you provide is positive. Talk about your strengths and weaknesses at a stretch. Prepare at least three strengths and three weaknesses.