
WebM, is a video codec that was freed by Google after its acquisition of On2.Ogg Theora, is a video codec derived from On2's VP3 codec.There are two main free video formats suitable for use on the web: If you want to share a video, it would be better to do it on a GNU MediaGoblin instance, instead of YouTube or other centralized video-sharing websites. Secondly, because they can be supported by Free Software natively they tend to perform better. User adoption of free formats encourages their use by websites. The use of free video formats on the web is the preferred method of playing video on the web. But for those who value their freedoms, there are alternatives. swf format and Adobe's official player are proprietary.

Adobe Flash is used to deliver many of the videos, advertisements, and browser-based games on the Web.
