Answer Description
A KVM (Keyboard, Video, Monitor) switch is a intermediary device that allows a single set of peripheral devices to be used with multiple PC's.
Wikipedia
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 Although multiple computers are connected to the KVM, typically a smaller number of computers can be controlled at any given time Modern devices have also added the ability to share other peripherals like USB devices and audio
KVM_switch - Wikipedia, the free encyclopedia