A switchblade is a type of pocketknife with a sliding or pivoting blade contained in the handle that is extended automatically by a spring when a button, lever, or switch on the handle or bolster is activated. It is also known as a switch knife, automatic knife, pushbutton knife, ejector knife, flick knife, stiletto, flick blade, or spring knife. The switchblade is usually spring-loaded and opens automatically when a button or switch on the handle is pressed. The typical switchblade looks like a regular folder, rotating around a hinge, but when the knife is being closed, tension from an inner spring is put on the blade. When fully closed, the tension is separated from the knife by a button. When the button is pressed, the tension of the spring is released back onto the blade and it flicks open without any effort. Switchblades are often associated with violence and have been banned in many states and countries.