The Reporting module allows you to create internal reports to watch the activity in the Kentico CMS system and on the web site, such as recently created documents, expired documents, web site visits, etc.. It's also used in the Site Analytics module.
You can manage the reports in CMS Desk -> Tools -> Reporting.
Page url: http://devnet.kentico.com/docs/devguide/index.html?reporting_module_overview.htm