Okay kiddo! So, you know how when you want to put a game on your computer, you have to plug in a little USB thingy? Well, when you want to plug in things like that into a big grown-up computer, there is a special group called PCI-SIG that makes sure that everything works together. They made a set of rules called a standard, so all the different parts of the computer know what to do when they get plugged in. It's like a big team that helps everything play nice together!