The .mkv file extension is related to Matroska Video File which is a multimedia container format. This essentially means that it is a container that can incorporate audio, video, and subtitles into a single file even if they use a different type of encoding. MKV files were designed taking care of the future requirements, which means that the MKV files would not become archaic. For this reason, there were numerous key features which were incorporated in the MKV files that would not make the format outdated. These features include fast seeking, chapter points, menu, and rich metadata support comprising ratings, descriptions etc., choice of selecting different audio and video streams, online streaming compatibility, multilingual subtitle support, and error recovery (playback of corrupt files). As MKV is not the industry standard, not all media players support it, though the support is speedily on the rise. There are two options for playing MKV files viz. using a MKV compatible media player or downloading the suitable codecs. The MKV container itself supports almost all the audio and video format, which is the reason that makes this format preferable and easy to use.