What is the purpose of a shut off valve for a toilet and how can it be properly maintained to ensure smooth operation?

The purpose of a shut off valve for a toilet is to control the flow of water to the toilet, allowing you to turn off the water supply in case of leaks or repairs. To properly maintain a shut off valve, regularly check for leaks, corrosion, or stiffness in the valve handle. Lubricate the valve if needed and replace it if it is damaged to ensure smooth operation.