Interview is the next step after you passed your resume to an employer. The human resource or anyone in charge of recruitment or personnel hiring will then hold an interview. If you passed the resume elimination process, you can be interviewed. Many fail at this part even if their resumes are very good. Interview can be that easy but still many fail as they did not expect to be asked on the common interview questions. As they have a guide then you also can get tips on how to answer it and get a good remark.
The first tip is to be prepared. You should prepare an answer beforehand so that you will not be caught off guard even if you appear to be very confident. You should not say anything and everything that is written in your resume. State the achievement you made and make it simple and direct. Talk about the current experience not beginning from the elementary years. Be serious and have enthusiasm in answering the question. The mindset of the interviewer is that you are not prepared to answer this question so you should really be prepared.
They also want to see what you can accomplish. That is why they ask you the question to see how you present yourself and how you deliver it especially if you are in the front line to deal with customers link. It is like a person in business sales that have to deal with customers all day.