KVM switch

Symbolic representation of a KVM switch. The computer on the right is currently being controlled by the peripherals.
Enterprise 1U rack mount KVM switch showing console and computer ports for DVI video, USB (keyboard/mouse) and analog audio

A KVM switch (with KVM being an abbreviation for "keyboard, video, and mouse") is a hardware device that allows a user to control multiple computers from one or more sets of keyboards, video monitors, and mice.