What is {{$guid}} used for in Postman?
<p>Postman's official website states that Postman has a few <a href="https://www.getpostman.com/docs/postman/environments_and_globals/variables#dynamic-variables" rel="noreferrer">dynamic variables</a>. My question is about: </p>

<blockquote>
  <p><code>{{$guid}}</code>: Adds a v4 style guid</p>
</blockquote>

<p>What kind of variable is <code>{{$guid}}</code>? How can it be used in test scripts for API requests?</p>