A keyboard switch is the mechanism located beneath each keycap that detects and registers a key press. Switches come in various types, such as mechanical, membrane, and optical, each offering different tactile feedback, actuation force, and durability. Mechanical switches, popular among gamers and typists, use individual physical components for each key, resulting in distinct feel and sound profiles. Membrane switches use pressure pads, providing a softer and quieter typing experience but often with less precision. Optical switches use light-based actuation for faster response times. The choice of switch affects typing comfort, speed, and overall user experience, making it a key consideration in keyboard selection.