One of the big things is know your resume!
Most of the interviews I've been on have gone like this
1. introductions
2. tell us about yourself
3. i see from your resume that you do this _____, can you elaborate or tell us more.
4. what if that system was changed slightly as seen here (interviewer draws a picture). how would you design the system?
5. repeat steps 3 and 4 a few timesIn my experience there are 2 things that need to be accomplished in an interview.
1. You prove to the interviewers that you can handle the work.
you do this by expanding on past projects (most of which should be in a resume), expanding on leadership experiences, and experiences showing work ethic, intelligence, etc.
2. You prove to the interviewers that you will will integrate with the culture/team/co-workers at the company
you do this by making a personal connection (sports, hobbies, work interests, etc), being polite, and being professional. Note this doesn't mean you have to be an all-american, captain of the football team, lead singer, alter boy.
Some people may look down on #2 and say it is not necessary for someone to do their job well. I partially disagree. While you can be the most introverted person in the world and still do well on the job, you need to communicate work items to your peers. That being said, if 2 people were equally skilled at their job, and I liked one and not the other, I would 100% want to work with the person I liked.