WEBM file

File extension	.webm
Category	Video File
Description	Similar to the MKV file extension, WEBM is a file format developed by a number of parties, including Google. Launched in 2010, it is open source format designed to deliver video through the web. It can be used for a variety of types of video, from video calls to high definition movies. WebM is growing, and by using the HTML5 version of YouTube, it is possible to watch video encoded in WebM.
Actions	WEBM Converter View other video file formats
Technical Details	WebM benefits from being designed for use on the modern web, rather than for local use. This means the format is specifically designed for the wide range of devices that are used to access the web, from Smart Phones to Powerful PCs. The video element of the file is encoded using VP8 video codec and the audio element of the file is encoded using the Vorbis audio codec.
Associated programs	Google Chrome Mozilla Firefox VLC Media Player
Developed by	Google (Previously developed by On2, Xiph, and Matroska)
MIME type	video/webm audio/webm
Useful links	Official WebM Site More Information on WebM Video Explaining WebM WEBM Converter

Using Zamzar it is possible to convert WEBM files to a variety of other formats

This page contains information on the WEBM file extension (WebM Video File), a popular video file format