A sink is a bowl-shaped or rectangular-shaped plumbing fixture used for washing hands, dishwashing, and other purposes. Sinks have faucets that supply hot and cold water and may include a spray feature to be used for faster rinsing. Many sinks, especially in kitchens, are installed adjacent to or inside a countertop. Kitchen countertops usually have rectangular-shaped sinks while bathroom countertops have bowl-shaped sinks.