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.

Files from Wikimedia Commons can be used across all Wikimedia projects in all languages, including Wikipedia, Wikibooks, Wikivoyage, Wikispecies, Wikisource, and Wikinews, or downloaded for offsite use. The repository contains over 41million media files. In July 2013, the number of edits on Commons reached 100,000,000.

The project was proposed by Erik Moller in March 2004 and launched on September 7, 2004. A key motivation behind the setup of a central repository was the desire to reduce duplication of effort across the Wikimedia projects and languages, as the same file had to be uploaded to many different wikis separately before Commons was created.

The aim of Wikimedia Commons is to provide a media file repository "that makes available public domain and freely-licensed educational media content to all, and that acts as a common repository for the various projects of the Wikimedia Foundation." The expression "educational" is to be understood according to its broad meaning of "providing knowledge; instructional or informative".

Most Wikimedia projects still allow local uploads which are not visible to other projects or languages, but this option is meant to be used primarily for material (such as fair use content) which local project policies allow, but which would not be permitted according to the copyright policy of Commons. Wikimedia Commons itself does not allow fair use or uploads under non-free licenses, including licenses which restrict commercial use of materials or disallow derivative works. For this reason, Wikimedia Commons always hosts freely licensed media and deletes copyright violations. Licenses that are acceptable include the GNU Free Documentation License, Creative Commons Attribution and Attribution/ShareAlike licenses, other free content and free software licenses, and the public domain.

Now, provide a numbered list of answers to these questions:

1. Who was behind Wikimedia Commons?
2. When did Moller first propose this?
3. When did it come to fruition?
4. What was the main motivation?
5. Before this project, what cumbersome task had to be repeated?
6. Are files available to only a select few?
7. What type of content?
8. What do they mean by the term "education"?
9. What else is Wikimedia Commons known as?
10. Do they charge money?
11. Does it hold audio files?
12. What about pictures?
13. Anything else?
14. What group sponsors it?
15. How many media files are on there?
16. How many edits?
17. Can these be found in different languages?
18. Do they keep copyrighted material?
19. What about freely licensed?
20. Is the Creative Commons Attribution license allowable?

Numbered answers:
1. Erik Moller
2. March 2004
3. September 7, 2004
4. the desire to reduce duplication of effort across the Wikimedia projects and languages
5. the same file had to be uploaded to many different wikis separately
6. No
7. public domain and freely-licensed educational media content
8. providing knowledge; instructional or informative.
9. Commons
10. No
11. Yes
12. Yes
13. Yes
14. the Wikimedia Foundation.
15. over 41million
16. 100,000,000.
17. Yes
18. No
19. Yes
20. Yes