A water closet (WC) is a term commonly used in many parts of the world to refer to a bathroom fixture that includes a toilet bowl and a flush tank. In simpler terms, it's a toilet. The term "water closet" is often used more formally or in technical contexts. In everyday language, people typically refer to it simply as a toilet. The toilet bowl is where waste is collected, and the flush tank holds water that is used to flush away the waste through a pipe system. It is an essential component of modern sanitation and plumbing systems in homes and buildings.