KVM switches (an abbreviation of keyboard, video, mouse switch) have been around for years in one form or another, allowing you to connect multiple devices to a tidy little box on your desk, and seamlessly move between PCs while your monitor(s), mouse, and keyboard come along with you. It is a time-saving productivity tool for anyone who uses multiple PCs, and can work with everything from Thunderbolt docks to your desktop. KVMs are also cheap, widely available, and can come with a range of features for every price point, including some that support up to 4K 120Hz across multiple monitors and even Thunderbolt connectivity. A KVM is essential to add to your setup if you use multiple machines (or a laptop docking station alongside a desktop machine), and here in no particular order are the reasons why.