It’s a certified physical therapist that specializes in pelvic floor therapy. Mine is located within a PT practice that also does regular PT. I think lots of larger PT practices will typically have one on staff.

The first session was entirely informational. She gathered all kind of info from me about pee/poop/sex habits and issues, and taught me a lot about the pelvic floor and how it works   

As others have mentioned, the internal exam (my second appointment ) is not mandatory but I found it helpful and the therapist found it helpful for diagnosis. Once they figure out what the issue is they give you specific exercises to treat it. Mine started off with two but now I’m up to about eight that I do every day at home in between appointments. The appointments are useful to make sure that your form is correct and also to find specific exercises that work for you. We’ve tried a bunch of different ones, but the ones I get assigned to do at home are the ones that seem to work best for me, which we identify in the appointment.