USB to PS/2 adapter lets you use your USB keyboard on computer and laptops with only PS/2 ports

If you only can use PS/2 (Purple PS/2 plug) keyboards and (Green PS/2 plug) mouse ports because your computer is very old and only have PS/2 ports, you'll need a USB to PS/2 converter for both your keyboard or mouse to convert your PS/2 plug to USB for use on your computer.