A water pool, often referred to simply as a pool, is a man-made structure designed to hold water for various purposes, primarily for swimming, recreation, or therapeutic activities. Pools can be found in different settings, such as:

1. Residential Pools: These are typically found in private homes and can range from small, backyard pools to larger, more elaborate designs.
2. Public Pools: These pools are accessible to the general public and are often found in community centers, recreation facilities, and hotels. They are regulated for safety and hygiene.
3. Swimming Pools: Specifically designed for swimming and often used for fitness and recreational purposes.
4. Wading Pools: Shallow pools designed for young children to splash and play in safely.
5. Therapeutic Pools: These pools are used for physical therapy and rehabilitation purposes due to their temperature-controlled water and accessibility features.

Pools are typically constructed with materials like concrete, fiberglass, or vinyl-lined, and they require regular maintenance to ensure water quality and safety. They may be equipped with filtration systems, heating systems, and various safety features such as fencing and lifeguard stations in the case of public pools.