Underwater diving is the practice of entering and exploring underwater environments, typically using specialized equipment. Divers often wear a wet suit or dry suit to protect against cold water and may use scuba gear to breathe while submerged. This activity can be recreational, such as exploring coral reefs, or professional, like underwater construction or research. Diving can take place in various bodies of water, including oceans, lakes, and rivers. Safety is crucial, so divers must be trained and often use a dive buddy system to ensure assistance in case of emergencies. Proper planning and knowledge of marine life are also important for a safe experience.