An interview is a conversation between an interviewer and interviewee where the interviewer asks questions to obtain information from the interviewee. There are different types of interviews including one-on-one, panel, group, and lunch interviews. The most common is a one-on-one interview where the interviewer asks both technical and general questions to evaluate the candidate's qualifications and skills. Proper preparation, research on the company and position, positive body language, clear communication, and following up after are keys to success in interviews.