Human: What is the difference between a scuba diver and a free diver? Assistant: 
The main difference between a scuba diver and a free diver is that a scuba diver uses a breathing apparatus to supply them with oxygen while a free diver relies on natural sources of air such as surface currents, wind, or waves. A scuba diver can stay underwater for longer periods of time than a free diver, but a free diver can move around more easily in the water.