One of the most commonly used term in desktop Linux world is Desktop Environment DE. If you are new to Linux you should understand this frequently used term.
A desktop environment is the bundle of components that provide you common graphical user interface GUI elements such as icons toolbars wallpapers and desktop widgets. Thanks to the desktop environment you can use Linux graphically using your mouse and keyboard like you do in other operating systems like Windows and macOS. .
There are several desktop environments and these desktop environments determines what your Linux system looks like and how you interact with it.
Most of the desktop environments have their own set of integrated applications and utilities so that users get a uniform feel while using the OS. So you get a file explorer desktop search menu of applications wallpaper and screensaver utilities text editors and more.