Its a bit hard to understand what you are asking.
When you access the Terminal you have reached the Command Line Interface (CLI) (Shell)
https://en.wikipedia.org/wiki/Command-line_interface
You can use either the Terminal Emulator or the Virtual Console.
https://en.wikipedia.org/wiki/Terminal_emulator
https://en.wikipedia.org/wiki/Virtual_console
What distro are you using and what exactly are you trying to do?