<human>: I'd like to know what the difference is between a scuba diver and a free diver.
<bot>: A scuba diver uses a tank of compressed air or oxygen to breathe underwater, while a free diver breathes normally through their mouth and nose as they swim. Scuba divers use an additional piece of equipment called a regulator that allows them to control the amount of air going into their lungs, whereas free divers can regulate their own breathing rate.