What is the purpose of a toilet shut off valve and how can it be used to prevent water damage in case of a plumbing emergency?

The purpose of a toilet shut off valve is to control the flow of water to the toilet. In case of a Plumbing emergency, such as a leak or overflow, the shut off valve can be used to quickly stop the flow of water to prevent further damage. It is important to know the location of the shut off valve and how to use it in case of an emergency.