A swimming pool (also known as a bath, wading pool or paddling pool) is a tank or large artificial basin filled with water for recreational and competitive swimming. It may be built into the ground, on a raised deck (as an inground pool) or as part of a building or other structure (as an above-ground pool). Pools can be constructed to a custom size and shape, or to a standard size and shape such as an Olympic swimming pool. In addition to swimming, pools can also be used for water exercise, floating on inner tubes and cooling off on hot days.
Swimming pools are often fenced to prevent unauthorized use by children and to protect swimmers from potential predators. Various methods are employed to keep the water clean and free of germs, including chemical chlorine and salt.
A well-maintained pool can also be used for aquatic sports such as synchronized swimming, water polo, and finswimming. In addition, they can be used for lifesaving and scuba diving training. Swimming pools are also used to teach water-ditching survival techniques for aircraft and submarine crews, and for astronaut training.
In the United States, the swimming pool is one of the most popular home features, with around 4.2 million private pools being installed in 2012. Many people enjoy the convenience of having their own backyard pools to swim in, and these can be very large. In some cases, pools can be made into a water park, complete with waterfalls and other features for the enjoyment of guests.
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