What is the purpose of a float switch for a sump pump and how does it help in maintaining the water level in the sump pit?

A float switch for a sump pump is used to automatically turn the pump on and off based on the water level in the sump pit. When the water level rises, the float switch triggers the pump to turn on and remove the excess water, helping to prevent flooding. When the water level drops, the float switch shuts off the pump, ensuring that the sump pit does not overflow.