Fullscreen is a display mode that allows content, such as videos or applications, to occupy the entire screen of a device, hiding all other interface elements like toolbars and menus. This mode enhances the viewing experience by eliminating distractions, making it ideal for watching movies, playing games, or giving presentations. In many devices, users can activate fullscreen by clicking a button or pressing a keyboard shortcut. Popular platforms like YouTube and Netflix offer fullscreen options to maximize visual engagement. This feature is commonly used in web browsers, media players, and gaming applications to provide an immersive experience.