In a Linux system, the shell is a command-line interface that interprets a user's commands and script files, and tells the server's operating system what to do with them. <span> The shell is a program that takes commands from the keyboard and gives them to the operating system to perform.</span>
An avatar, is the icon or animation that is used to represent a participant in an internet chat. Avatars are usually customizable to make it more 'you.'