If they are selected, then they go through 2 days of orientation with speakers talking about the opportunities at the company, what makes us a great place to work (even if we're not). Housing is provided at a local college if they are from a distant area.
During their time at the company, they will have networking events and more speakers every two weeks or so. They don't produce much output since they need to get a machine and security assigned to them as well as learn the company structure. The company views interns as a way to capture low-cost college talent in a 'try before you buy' setting - they look for potential and hard to find diversity categories while making the intern's experience easy.