Source: Linux Tutorial on Ryans Tutorials
1. The Command Line
The connection between command line/Terminal/Basn is that the command line is also called the Terminal, and it runs Bash.
Command is typically the first thing you type, followed by the command line arguments separated by spaces.
The shell is the part of the OS that defines how the terminal will behave and looks after running commands for you. The most common shell is bash, bourne again shell.