Simplify the following text for a Grade 12 native English-speaking person.
Original: Wikimedia Commons ( or simply Commons ) is an online repository of free-use images , sound and other media files . It is a project of the Wikimedia Foundation , from which uploaded files can be used across all Wikimedia projects in all languages , including Wikipedia , Wikibooks , Wikisource and Wikinews , or downloaded for offsite use .
Simplified: The files uploaded to Wikimedia Commons can be used by any other Wikimedia Foundation project , like Wikipedia or Wiktionary .