GUI
also: graphical user interface, desktop environment, X11, Wayland
A graphical user interface (GUI) is a visual way to interact with a computer using windows, icons, menus, and a pointer instead of typing commands. Most Linux desktop environments like GNOME and KDE provide GUIs.
A GUI lets users interact with their Linux system by clicking buttons, dragging files, and navigating menus—no command-line knowledge required. This contrasts with the terminal, where users type text commands to accomplish tasks.
Linux desktop environments like GNOME, KDE Plasma, and Cinnamon are GUIs built on top of the Linux kernel. They manage windows, handle mouse and keyboard input, and display visual elements like file managers and application windows.
For example, you might drag a file icon to a trash folder in a GUI file manager, whereas the command-line equivalent would be rm filename. Many Linux users combine both approaches—using the GUI for casual tasks and the terminal for powerful automation.