What is A button that can be turned on by clicking once and turned off by clicking it again?

A button that can be turned on by clicking once and turned off by clicking it again is commonly referred to as a toggle button. This type of button allows users to switch between two states, typically "on" and "off," with each click changing its current state. Toggle buttons are often used in user interfaces for settings, such as enabling or disabling features. They provide a simple and effective way to manage options with a single control.