 called an <strong>auth
token</strong>, that represents both the user's identity and the application's
authorization to act on the user's behalf. This lesson demonstrates connecting
to a Google server that supports OAuth2. Although Google services are used as an
example, the techniques demonstrated will work on any service that correctly
supports the OAuth2 protocol.</p>

<p>Using OAuth2 is good for:</p>
<ul>
<li>Getting permission from the user to access an online service using his or
her account.</li>
<li