SCUBA stands for "Self-Contained Underwater Breathing Apparatus." It is a system that allows divers to breathe underwater using a tank of compressed air. SCUBA gear typically includes a mask, fins, a wetsuit or drysuit, and a buoyancy control device, which helps divers manage their ascent and descent in the water. SCUBA diving is popular for recreational activities, underwater exploration, and scientific research. Divers can observe marine life, coral reefs, and shipwrecks while using SCUBA equipment. Safety training and certification, often provided by organizations like PADI or NAUI, are essential for anyone interested in diving.