KVM is an acronym for Keyboard Video Mouse. Typically a KVM switch is an AB or ABCD type of switch that shares one Keyboard-Video-Mouse with multiple computers to reduce clutter. You press a button on the KVM or use a hot key sequence to change from one computer to the other. I have one monitor on my desk at home, but i can select between 4 computers.
E is asking about IP, which means he wants to use network cables, rather than physical KVM cables, to do the sharing. Monitor cables can get finicky at high resolutions when trying to run long distance.
I am curious about IP KVM also, because it means you could remote control computers in remote areas of your house or office. You can kinda to this now with Remote Desktop or VNC, but those solutions only work once the computer is fully booted and Windows starts. A KVM lets you into the BIOS, etc.