Conventional keyboards have mechanical keys and capacitive keys. In the industrial computer keyboard, there is also a keyboard that touches the membrane keys. The mechanical keyboard is a structure that has been selected for a long time. It is generally similar to the principle of a touch switch to make the contacts turn on or off. It has the characteristics of simple technology, convenient maintenance, ordinary feel, high noise, and easy wear.

Most cheap mechanical keyboards use copper sheet springs as elastic materials. The copper sheet is easy to fold and lose its elasticity, and the failure rate increases over time. Capacitive keyboards. It is a keyboard based on capacitive switches. The principle is that the capacitance changes after the button changes the interval between electricity, which temporarily constitutes the condition for the vibration pulse to pass.

 Theoretically, this kind of switch is non-contact and non-touch, the wear rate is small or even negligible, and there is no hidden danger of bad touch. It has low noise, simple control feel, and high-quality keyboard can be manufactured, but the process is more mechanical. Messy. There is also a keyboard for industrial computer, which uses light-touch membrane keys for thorough sealing, which is only suitable for special occasions.

 According to the shape of the keyboard, the shape of the keyboard is divided into a standard keyboard and an ergonomic keyboard. The keyboard interface has AT interface, PS/2 interface and new USB interface, desktop computers mostly use PS/2 interface, most motherboards provide PS/2 keyboard interface. Older motherboards often provide AT ports, also known as "big ports", which are not common anymore.