A bathroom is a room in which people wash their bodies or parts of their bodies. It can contain one or more of the following plumbing fixtures: a shower, a bathtub, a bidet, and a sink. The inclusion of a toilet is common. There are also specific toilet rooms, only containing a toilet, which in North American English tend to be called "bathrooms", "powder rooms" or "washrooms", as euphemisms to conceal their actual purpose, while they in British and Irish English are known as just "toilets" or possibly "cloakrooms" - but also as "lavatories" when they are public.

A toilet is a piece of sanitary hardware that collects human urine and feces, and sometimes toilet paper, usually for disposal. Flush toilets use water, while dry or non-flush toilets do not. They can be designed for a sitting position popular in Europe and North America with a toilet seat, with additional considerations for those with disabilities, or for a squatting posture more popular in Asia, known as a squat toilet. In urban areas, flush toilets are usually connected to a sewer system; in isolated areas, to a septic tank. The waste is known as blackwater and the combined effluent, including other sources, is sewage. Dry toilets are connected to a pit, removable container, composting chamber, or other storage and treatment device, including urine diversion with a urine-diverting toilet.