WebM is an open media container compressed with VP8 video codec and Vorbis audio codec. WebM format has high video playback quality and data compression parameters.The format is widely used for adding media to web pages and it is supported by all modern web-browsers like Opera, Mozilla Firefox and Google Chrome. The embedding of WebM videos to a site page realizes without delays and errors. WebM is meant to be an alternative to the h.264 standard. The copyright of the extension is held by Google.

This format was originally created as an alternative to mp3. The idea was to achieve a small file size with better sound quality. The first versions weren’t quite successful, but with the development of AAC, it became possible to store sound with less loss of quality, and with the same file sizes as that of mp3.