A pool cover is a protective layer placed over a swimming pool when it is not in use. It helps keep debris, such as leaves and dirt, out of the water, making maintenance easier. Additionally, pool covers can help retain heat, reducing energy costs for heating the water. There are different types of pool covers, including mesh covers, solid covers, and automatic covers. Each type serves a specific purpose, such as safety, insulation, or convenience. Using a pool cover can also help prevent evaporation and reduce chemical usage, contributing to a more eco-friendly pool environment.