An "Extended Desktop" is a display setting that allows users to spread their computer's desktop across multiple monitors. This feature enables users to increase their workspace, making it easier to multitask by having different applications open on separate screens. For example, one monitor can display a web browser while another shows a document. To set up an Extended Desktop, users typically connect additional monitors to their computer and adjust the display settings in their operating system, such as Windows or macOS. This setup is popular among professionals, gamers, and anyone who benefits from having more screen real estate.