Single-handle faucets are plumbing fixtures that allow users to control both the temperature and flow of water with a single lever or handle. This design simplifies operation, making it easy to adjust the water to the desired temperature with one hand. They 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 regulates water flow and temperature. Single-handle faucets are available in various styles and finishes, making them a popular choice for homeowners looking to enhance their kitchen or bathroom decor.