Scuba diving is a sport that involves a person breathing underwater. Divers are trained in using an underwater apparatus that includes a regulator and a tank of compressed air. They wear a mask and fins to stay underwater for long periods of time.

There are several organizations that provide scuba diving courses. You can complete your training in a group or individually. The PADI (Professional Association of Dive Instructors) is the largest dive agency in the world with 27 million certified divers. It also offers scuba equipment rentals.

If you are interested in scuba diving, you will need to be healthy and in good shape. Having heart problems or other medical conditions may prevent you from getting certified.

Some people go diving for recreational purposes, but many divers descend into the depths for scientific or commercial purposes. In the military, special forces are trained as divers.

Some of the most famous scuba divers are underwater photographers and scientists. Other diver types are interested in exploring underwater wrecks or caves.

When you are diving, you will need to check your buoyancy control device regularly. This is an important part of the sport. Depending on your equipment, you may have a pocket or secret air bladder to keep you neutrally buoyant.

You will also need to have a buddy. Your buddy will ensure that you are safe while diving. A buddy can help you in emergencies and is essential to the safety of you and your equipment.