title: how does serverless invoke in aws
body: <p>I am new to this whole serverless framework.  I created my first serverless function as documented here <a href="https://www.npmjs.com/package/serverless#quick-start" rel="nofollow noreferrer">https://www.npmjs.com/package/serverless#quick-start</a>.  Next when I do a "serverless invoke" it works.  I am confused how this works, the questions I have around this are</p>
  
  <ol>
  <li>There does not seem to be an API gateway created so how can it invoke?</li>
  <li>There are also stages mentioned in the serverless.yml file, I'm not sure what these translate to</li>
  </ol>
  
  <p>Any help on this is highly appreciated.</p>