Keyboard and mouse combinations can be classified from multiple dimensions such as interfaces, number of buttons, and internal structure.
Interface classification
AT interface: commonly known as "big mouth", commonly found in AT motherboards, now obsolete.
PS/2 interface: purple interface in ATX motherboards.
USB interface: mainstream interface with hot-swappable features.
COM interface: 9-pin serial port.
Key number classification
83-key keyboard: a less common configuration.
85-key keyboard: a few keys less than a standard keyboard.
101-key keyboard: a more common configuration.
104-key keyboard: a standard keyboard with two start keys and one menu key added.
107-key keyboard: three more keys, power, wake up, and sleep, added to the 104-key keyboard.
Internal structure classification
Mechanical keyboard: strong and durable, suitable for scenarios that require high-intensity use.
Membrane keyboard: high reliability and low noise.
Capacitive keyboard: good durability, high sensitivity, good stability.
Mouse classification
Two-button mouse: traditional two-button design.
Three-button mouse: adds a button under the middle scroll wheel.
Four-button mouse: adds an extra button on the basis of the three-button mouse.
