The interview provides you the opportunity to sell your qualifications and abilities to the employer. If your resume was successful in "getting your foot in the door," the interview is your chance to prove you are the person for the job. Remember that the interview is a two-way process: it offers both you and the employer the chance to evaluate whether or not there is a match for employment.
Effective interviews require careful and thorough preparation on your part. Knowing what to expect, including the kinds of questions that you may be asked and how to respond to them, gives you greater self-confidence and increases the chance that your interview will be successful. Everyone can learn to interview well by developing effective interview skills, gaining an understanding of the interview process, and projecting the right attitude and image.