PHP - Proxy Script
<p>I've been reading this book about PHP and MySQL and at the end of each chapter it asks you some questions for you to research about and one of them I don't really get:</p>

<blockquote>
  <p><em>What is a Proxy script? When might a proxy script be necessary?</em></p>
</blockquote>

<p>I hope you could help me answering this question because I don't really know what it is (<em>I do know what a proxy server is though</em>)</p>