Steam Input is a customizable input system developed by Valve for the Steam platform. It allows users to remap controller buttons, sticks, and trackpads for individual games, enabling compatibility with a wide range of controllers, including Xbox, PlayStation, Switch Pro, and generic gamepads. Steam Input supports advanced configuration options, such as creating macros, adjusting sensitivity, and assigning keyboard or mouse functions to controller inputs. This flexibility enhances accessibility and gameplay experience, especially for users with specific preferences or accessibility needs. By translating controller inputs to game commands, Steam Input also allows games without native controller support to be played with various devices.