Keyboard designs refer to the various layouts and styles of keyboards used for typing on computers and other devices. The most common layout is the QWERTY design, named after the first six letters in the top row. Other layouts include AZERTY and Dvorak, which aim to improve typing efficiency and comfort. Keyboards can also vary in physical design, such as mechanical versus membrane keyboards. Mechanical keyboards use individual switches for each key, providing tactile feedback and durability, while membrane keyboards use a pressure pad system, making them quieter and often more affordable.