Crucial to understand shell to effectively control the Linux system. A Linux terminal is called shell, which gives text-based IO interface to users and the kernel.
Terminal Emulator Is a software that emulates the function of a terminal. It allows the use of text-based programs within a graphical user interface (GUI). There is also a command-line interface (CLI) that run additional terminals in one terminal.
Shell The most commonly used shell in Linux is called Bourne-Again Shell (BASH) and is part of the GNU project. Gives the possibility to interact with programs and processors to get information faster.