I've just begun to learn pneumatics and I'm really confused where the pneumatic cylinder falls under in the categorization of what kind of mechanical motion it is suppose to produce. I've seen one source say that it is rotary and for analogy the motor is its linear counterpart. But I haven't seen any other sources to back this up definitely. I understand that it might be possible for there to be both types.

What is the classification of the one that's most commonly discussed when like someone is new to pneumatics?