title: What is a callout in salesforce
body: <p>I am reading about callout, and it is something I don't understand.
  <a href="https://trailhead.salesforce.com/en/force_com_dev_beginner/apex_triggers/apex_triggers_intro" rel="nofollow">https://trailhead.salesforce.com/en/force_com_dev_beginner/apex_triggers/apex_triggers_intro</a></p>
  
  <p>Is it a simple asynchronous call?, Is it a callback? What is the meaning?</p>