Mangrove restoration is when people help plants called mangroves grow in places where they used to be. Mangroves are special plants that live in salty water, like the ocean or a bay. They are important because they help keep the water clean, and provide food and shelter for animals in the water. People help restore mangroves by planting new plants or helping existing ones grow. People also remove things like trash or too much dirt or sand that can block the mangroves from getting enough sunlight.