Plesk has an entire Application Vault you can install website software from, including popular titles such as WordPress, Drupal, and Joomla. The Application Vault makes installing, setting up, and managing these applications easy and integrates them into Plesk as much as possible. Plesk also knows how to manage software installed via the Application Vault when it takes backups. In other words, if there is an application you would like to install on your site and it's in the Vault, you are encouraged to use the Vault whenever possible.
Next: Statistics Tab