Use a GiliSoft MKV to MP3 converter on Windows when you want to extract audio from MKV video files into MP3 for listening, reuse, reference, or lighter audio-only output. This is useful when the video is not needed and the soundtrack, speech, lesson audio, or music track is the real target.
Most users are not looking for a broad video-conversion explanation. They usually have a simple goal: take an MKV file and keep only the audio. That often applies to lessons, voice recordings, interviews, or other video files where the audio track is the real value and MP3 is the more convenient output.