How to use MKV converter to convert MKV to MP4, AVI, etc

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What’s MKV video format?
An MKV file is a Matroska file, the Matroska Multimedia Container is an open standard free Container format . It is similar in conception to other containers like AVI, MP4 or ASF, but is entirely open in specification, with implementations consisting mostly of open source software. Matroska file types are .MKV for video (with subtitles and audio), .MKA for audio-only files and .MKS for subtitles only.
How to use Windows [...]