The purpose of an interview is to assess your suitability for a particular job. Your interviewer wants to find out what kind of person you are, what qualities and experience you can bring to the job and how you will fit in with the organisation. Interviews can take several different formats , and you may have to attend more than one. You will normally have an interview with the personnel department and a more technical interview. The panel can consist of two or more interviewers, all of whom will be assessing your performance.
Some organisations hold a second round of interviews.
You should be told in advance who will be interviewing you, and the length of time it is likely to take.