A float switch is a device used to detect the level of liquid in a tank or container. It operates by using a floating object that rises and falls with the liquid level. When the float reaches a certain height, it activates a switch, which can turn on or off a pump or alarm, helping to manage the liquid levels effectively. Float switches are commonly used in various applications, including sump pumps, sewage systems, and aquariums. They help prevent overflow or dry running of pumps, ensuring safe and efficient operation in both residential and industrial settings.