The "source" command in Linux is used to execute commands from a file in the current user shell (terminal). For example, to run a script file in the current terminal.
As an example of this command, let's assume you have a script file called myscript.sh and it's saved in your user files in your sub-directory called "Projects." If you want to run that script file in your current terminal you would use the following command:
This will execute the commands written into the given file within the active terminal (or shell) window.