Normally, directly give a presentation.
They will know your work and judge by the presentation, Many questions about your work detail. So be sure to very familiar your work.
Normally after presentation, the lab would have the idea of keep or not offer.
Interview questions [1]
Question 1
Some question that fall into the lab area but you might not very familiar. So should be very familiar their work and think what your work might contribute to the lab.
I applied online. I interviewed at Stanford University
Interview
It was a great interview process and the hiring process was complete and sound and did a great job at asking questions and was very friendly and nice and very nice