A "single-handle" refers to a type of faucet or valve that is operated with one lever or handle. This design allows users to easily control both the temperature and flow of water with a simple up-and-down or side-to-side motion. Single-handle faucets are commonly found in kitchens and bathrooms due to their convenience and modern aesthetic. These faucets typically feature a cartridge or ball mechanism inside, which helps regulate water flow and temperature. The single-handle design is often preferred for its ease of use, especially for individuals with limited mobility. Many homeowners choose single-handle faucets for their efficiency and sleek appearance.