A scuba tank is a high-pressure cylinder used to store compressed air for underwater diving. It allows divers to breathe while exploring underwater environments. Typically made of aluminum or steel, these tanks come in various sizes and are designed to withstand the pressure of deep water. Before diving, the tank is filled with air or a special gas mixture, depending on the dive's requirements. Divers connect the tank to their regulator, which controls the flow of air. Proper maintenance and regular inspections are essential to ensure the tank's safety and functionality during dives.