An add-on is an installable component that supplements or enhances the functionality of Confluence in some way. For example, the Team Calendars for Confluence is an add-on that lets users embed team calendars into Confluence pages. Other Confluence add-ons are available for creating charts, tracking usage and modifying the Confluence visual theme.
Confluence comes with many pre-installed add-ons (called system add-ons). You can install more add-ons either by acquiring an add-on from the Atlassian Marketplace or by uploading an add-on from your file system. This means that you can install add-ons that you have developed yourself. For information about developing your own add-ons for Confluence, see the Confluence Developer documentation.
The Universal Plugin Manager (UPM) is itself an add-on that you use to administer add-ons from the Confluence Administration Console. UPM works across Atlassian applications, providing a consistent interface for administering add-ons in Confluence, Crucible, Fisheye, JIRA, Stash or Bamboo.
UPM comes pre-installed in recent versions of all Atlassian applications, so you do not normally need to install it yourself. However, like other add-ons, the UPM software is subject to regular software updates. Before administering add-ons in Confluence, therefore, you should verify your version of the UPM and update it if needed.
You can update UPM, or any add-on, from the UPM's own add-on administration pages. Additionally, you can perform these tasks from the administration pages:
If the add-on request feature is enabled in your Atlassian application, non-administrative users can also discover add-ons on the Atlassian Marketplace. Instead of installing the add-ons, however, the users have the option of requesting the add-ons from you, the administrator of the Atlassian application. For an end-user's view of the add-on request feature in Confluence, see Requesting Add-ons.
For more information on administering this feature and performing other add-on administration tasks, see the Universal Plugin Manager documentation.
For add-on information specific to Confluence, see these pages: