Rainwater harvesting is a way of collecting rain and storing it so it can be used later. It works like this: when it rains, the rainwater falls onto the roof of your house or from other surfaces, like driveways or streets. The rainwater is then collected in containers or tanks that are specially designed for storing water. This stored rainwater can then be used for watering plants, flushing toilets, cleaning cars, or even for drinking water! By harvesting and storing rainwater, you can save money and help protect our environment by reducing the amount of water taken from lakes, rivers, and other natural sources.