The purpose of the job interview is to persuade the employer that you have the skills, background, and ability to do the job and that you can comfortably fit into their organization. Everyone must understand that you are not just being evaluated on your experience and education alone, but also by your looks, personality, confidence, enthusiasm, and any other attribute that can help them decide whether or not you are right for the job. You may find out that some people get hired just because the interviewer "liked"  them. Of course this is not always the case, but developing effective interviewing skills can help!