You will be greeted by the First interviewer and will have series for interviews on that day. Some will be to the point and others will be more friendly. The interview process will be for an entire day. This is assuming you have gone through the phone screen. Recruiter will be quite helpful with any questions you have and will also help in preparing you for the interview. Experience can be different depending on the team you are interviewing with. If you are applying for a specific position then It's mostly people from that team who will interview you. For new college grad, interviews are conducted from a common pool and placed in different teams. Since in my case I was interviewed by the people in the team it helped me to understand how each of them are and how they behave and ask questions and if we are compatible and can work with each other. Point being you don't want to work with morons.