Most of the time when we use our computers, we do so through a graphical user interface, or GUI for short. A GUI is a system designed with icons and visual representations of the machine's file systems.
Programmers often use another kind of interface, called the command line. A CLI, or command line interface, uses textual commands, rather than dragging and dropping icons, to give the computer instructions.
The application responsible for running a CLI is called a terminal and the program interpreting the commands is called the shell.
The terms "command line", "terminal", and "shell" are often used interchangeably.
Both of the images above represent the same file structure. While the GUI may now appear more user-friendly, as you grow more familiar with the commands available, you'll find there can be advantages to using the terminal.
In the terminal, you will be able to: