From Joomla! Documentation
Revision as of 07:00, 12 January 2015 by FuzzyBot (Updating to match new version of source page)
An Upgrade Package in Joomla! is an archive of files that contain the files that have changed between Joomla! versions. When this archive is unpacked, it replaces the old version of the modified files with the new version. For example, if fifty files were changed between version 3.x.1 and 3.x.2, the upgrade package from 3.x.1 to 3.x.2 would contain these fifty files and, when unpacked, would replace these fifty files and upgrade the installed version from 3.x.1 to 3.x.2.