I am peri-op. We have pre-op holding, PACU and then phase 2. Someone else on here described them well. Make sure you have ACLS, PALS and a critical care course under your belt before you apply. I like working in pre-op holding the best because the patients are "with it". You get to help patients and their families deal with their pre-procedure worries. I find it the most fufilling because you are most likely the only nurse they will remember in the end. They are too out of it to remember any other peri-op nurse. You also have TONS of interaction with the doctors and CRNA's this way. They don't show up to PACU much and never to phase 2.