An HDMI switch is a device that allows multiple HDMI sources, like a Blu-ray player, gaming console, or streaming device, to connect to a single HDMI input on a TV or monitor. This is useful when you have limited HDMI ports on your display and want to easily switch between different devices without constantly plugging and unplugging cables. Using an HDMI switch is straightforward; you simply connect your devices to the switch and then connect the switch to your display. Most switches come with a remote control or a button to select which device you want to view, making it convenient to manage your entertainment setup.