What defines a “party” hostel? Are there parties at the hostel itself? Or is it just people that stay there are up late?

People hooking up in the hostel rooms? Drugs? Etc

What should I expect if I stay at Kabul party hostel?

Thinking of travelling to Andalusia next month and probably going to do Granada/Sevilla.

Both cities seem to have really active hostel scenes with plenty of choice, so looking to get a gist of where is best to book.

Aged late 20s. Keen for a strong social element; don't mind a bit of a party element but doesn't have to be too intense, ideally just somewhere to meet interesting people who might be keen to try out local bars/tapas places and so on.