Let’s compare the Ultrabook (Dell’s super thin laptop) to a desktop PC. Most people would probably go for an Ultrabook these days, because it’s lighter, silent, and can be carried nearly everywhere. So does a desktop PC have any advantage at all, apart from its lower price? Yes—it is modular. What would you do with an Ultrabook when its processor breaks or its power connector burns out? These kinds of problems would likely make the Ultrabook unrepairable. But if this happened to a desktop PC’s monitor or power supply, those can be replaced easily. The capability to replace PC components is supported by standardized connectors. They allow us to build a whole PC by using components from different vendors.