The Matroska Multimedia Container is an open standard free container format, a file format that can hold an unlimited number of video, audio, picture, or subtitle tracks in one file.
It is intended to serve as a universal format for storing common multimedia content, like movies or TV shows. Matroska is similar in concept to other containers like AVI, MP4, or Advanced Systems Format (ASF), but is entirely open in specification, with implementations consisting mostly of open source software. Matroska file extensions are .MKV for video (with subtitles and audio), .MK3D for stereoscopic video, .MKA for audio-only files, and .MKS for subtitles only.
MKV files are video files which are similar to AVI and MOV formats and supports several different types of audio and video codecs. The MKV file format is an acronym for Matroska Video File. If you have recently downloaded a MKV file, you might not be able to open it with Windows Media Player. However, there are several other free video players which will allow you to watch movies that have an MKV extension.
In order to watch videos with the .MKV file extension, you should download the VLC player or DivX Player. You can download the above players from the following links:
VLC Player –videolanDOTorg/vlc/
DivX Player –divxDOTcom/
Once you have downloaded and installed the software, you can then just double click on the MKV file and open it or use the “File -> Open” dialog provided by these players to browse and open your MKV file.
A range of software has native Matroska support. Those include media players such as Zoom Player, PotPlayer, MPlayer, VLC, GOM Player, ALLPlayer, Elmedia Player, foobar2000 and PowerDVD and media centers such as Plex, Boxee, PS3 Media Server and XBMC, and the web browser Google Chrome. A number of software tools such as HandBrake and Pinnacle Studio also support Matroska.