"Fullscreen Windowed" (also known as Borderless Windowed) is a display option in games that allows the game to be played in a window that covers the entire screen, without any visible borders or window chrome, while still maintaining the benefits of running in windowed mode, such as faster alt-tabbing and easier access to other applications. This display mode is especially useful for players who use multiple monitors or need to frequently switch between the game and other applications.