Lifeguards are responsible for supervising water areas like pools, beaches, and lakes to ensure public safety. They are trained in water rescue, first aid, and emergency response. Lifeguards must be strong swimmers, monitor water users for signs of distress or drowning, clear water areas during emergencies, and administer first aid when needed. They use equipment like rescue tubes, spineboards, and first aid kits and communicate with whistles and flags. Lifeguards work from elevated chairs or towers to best oversee their assigned supervision area.