A rain barrel is a container used to collect and store rainwater from rooftops. When it rains, water flows from the gutters into the barrel, allowing homeowners to save this natural resource for later use. This stored water can be used for watering gardens, washing cars, or even filling bird baths, making it an eco-friendly choice. Using a rain barrel helps reduce water bills and conserves water during dry spells. It also helps prevent stormwater runoff, which can lead to erosion and pollution in local waterways. By utilizing a rain barrel, people can contribute to a healthier environment while enjoying the benefits of free water.