title: In Active Directory, what is a resource?
body: <p>In the examples and tests for the AAD node.js library, <code>00000002-0000-0000-c000-000000000000</code> is always passed as the resource. What is <code>00000002-0000-0000-c000-000000000000</code>?</p>
  
  <p>The <a href="https://github.com/AzureAD/azure-activedirectory-library-for-nodejs/blob/731946bcfa8cb7ed709a099df791ed0906f06452/lib/authentication-context.js#L245" rel="noreferrer">documentation</a> just says that a resource is "A URI that identifies the resource for which the token is valid." But <code>00000002-0000-0000-c000-000000000000</code> is a UUID. What is a resource, and what can the value here be?</p>