A swimming pool is a structure designed for swimming or recreational activities. It is typically filled with water and can be found in various settings, such as homes, hotels, and public facilities. Pools come in different shapes and sizes, including rectangular, oval, and kidney-shaped, and can be made from materials like concrete, fiberglass, or vinyl. Swimming pools can be either above ground or in-ground, with in-ground pools often requiring more construction and maintenance. They are equipped with filtration systems to keep the water clean and safe for users. Many pools also feature additional amenities, such as diving boards, slides, and lighting for nighttime use.