Modules are plugins for Drupal that extend its core functionality. You can select which modules are enabled. Once a module is enabled, new permissions might be made available. Modules can automatically be temporarily disabled to reduce server load when your site becomes extremely busy by enabling the throttle.module and checking throttle. The auto-throttle functionality must be enabled on the throttle configuration page after having enabled the throttle module.

It is important that update.php is run every time a module is updated to a newer version. You can find all administration tasks belonging to a particular module on the administration by module page.