PS/2 is a now obsolete standard connector used to connect keyboards, mice, and other input devices to a computer.
Is PS/2 or USB better for keyboards and mice?
In general, it refers to the types of cables (PS/2 cable), ports (PS/2 port), and other connectors used in these types of keyboards and mice.
These ports are round and consist of 6 pins. In most cases, purple PS/2 ports are for keyboards, while green ports are for mice.
This type of connection was first introduced in 1987 with the IBM Personal System/2 series of personal computers. The standard has been completely replaced by the much faster and more flexible USB standard in consumer machines. PS/2 was officially declared a legacy port in the year 2000, paving the way for the complete takeover of USB.