How does a trip lever bathtub drain work to control the drainage of water in a bathtub?

A trip lever bathtub drain works by using a lever mechanism to open and close a stopper in the drain. When the lever is lifted, the stopper is raised, allowing water to flow out of the tub. When the lever is lowered, the stopper closes, preventing water from draining out. This control mechanism allows the user to easily adjust the drainage of water in the bathtub.