Pools that may be used by many people or by the general public are called public, while pools used exclusively by a few people or in a home are called private. A pool can be built either above or in the ground, and from materials such as metal, plastic, fiberglass or concrete. There are many standard sizes the largest and deepest is the Olympic size. Home Swimming Pools Became Popular in the USA After World War IIĪ swimming pool, swimming bath, wading pool, or simply a pool, is an artificially enclosed body of water intended for swimming or water-based recreation.