Sorry for not including "cut." That was unprofessional of me. Besides, cut will be the least used out of all three. Unless you're doing some serious editing on notepad or mail cut doesn't have much to do with it... however maybe we'll be able to edit Office/iWork documents in the future.
Cut could also be a way to bulk delete a bunch of text without just holding down the delete key in the keyboard for a while. That's actually the only way I've used cut so far haha.