A Gentle Introduction to tmux
Too Long; Didn't Read
The official verbiage describes tmux as a screen multiplexer, similar to GNU <a href="https://www.gnu.org/software/screen/" target="_blank">Screen</a>. Essentially that means that tmux lets you tile window panes in a command-line environment. This in turn allows you to run, or keep an eye on, multiple programs within one terminal.