They asked behavioral questions. There were 5 of them and they did not really stray too far from that format. As long as you are personable and friendly and come prepared with questions to ask them then you should be good.

Initial round 15 minute phone screen with a recruiter. Second round was with a 30 minute panel taking turns asking about my experiences on my resume. Third round was similar to the second round with a different panel and more in-depth questions. People were very nice, I had audio issues during the second phase but they were forgiving.