title: Sub command line after typing \ or ` in Linux
body: <p>What is the sub input terminal that shows up when I type the character \ or ` (backtick) into a Linux command line? It shows up with what I assume is a prompt that contains a single ">" character. (see image below)</p>
  
  <p>It almost appears to be a scripting terminal (like python's ">>>").</p>
  
  <p><a href="https://i.stack.imgur.com/iutLc.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/iutLc.png" alt="enter image description here"></a></p>
  
  <p>I tried asking google but the question is hard to explain.</p>