A lifeguard is a trained professional responsible for ensuring the safety of people swimming in pools, beaches, or other aquatic environments. They monitor the water for any signs of distress, enforce safety rules, and provide assistance in emergencies. Lifeguards are often certified in first aid, CPR, and water rescue techniques. In addition to their monitoring duties, lifeguards also educate the public about water safety and the importance of following rules to prevent accidents. They typically work in teams and may use equipment like rescue tubes and whistles to help manage safety and respond quickly to incidents.