I had a phone call with a recruiter for around 1/2 an hour and we talked about the position and the company. We mostly talked about the team I would be on and how my experience would line up with this position. Also be prepared to talk about their culture, why you want to work there, and how you've shown initiative in the past.

Super easy interview - don't stress! Just make sure to do your homework and research prior and make it clear that you came prepared. They are mostly trying to gauge team fit and overall aptitude for the internship.