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      <h1>Application Programming Interfaces</h1>
<p>Application programming interfaces (APIs) provide machine-readable
data transfer and signaling between applications.</p>
<h2>API resources</h2>
<ul>
<li><a href="https://zapier.com/">Zapier</a> has an
  <a href="https://zapier.com/blog/apis-101/">APIs 101</a> free guide for what APIs 
  are, why they are valuable and how to use them properly. </li>
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