If the laptop you are using only has a USB interface and does not have a PS/2 keyboard and mouse interface but you need to use a PS/2 interface keyboard or mouse a USB to PS/2 cable can solve your actual problem. It is the best solution to use your old PS/2 mice and keyboard which also saves the USB port since the USB ports are limited. It is also suitable for computers that have broken a PS/2 interface. It is the best solution to use your old PS/2 mice and keyboard which also saves the USB port since the USB ports are limited.
The USB to PS2 adapter supports bus-power meaning no power adapter is needed no software or special drivers are required. This can be particularly useful if you have a specialty keyboard or mouse device and a PC without PS2 ports.