What does the 'echo' command do?

The 'echo' command is used in the Linux shell to display a line of text or the value of variables directly in the terminal. When invoked, it takes the text or content specified as an argument and outputs it to the standard output, which is usually the terminal window the user is currently working in. This functionality makes 'echo' a valuable tool when creating scripts or performing command-line operations, as it allows users to view information or results instantly. By using it to display variable contents, users can effectively debug scripts or confirm values during command executions.