Drupal can be readily configured to act as an Intranet or Extranet solution. An Intranet is generally defined as an information system for posting and sharing information that functions in much the same way as the general Internet, except that the information is restricted for people within the organization: employees, managers, board of directors, etc. An Extranet is simply an Intranet the allows select access to groups or individuals outside of the organization: vendors, partners, clients, etc.