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MKA is what you get when you take the MKV container and remove the video track. It's a Matroska file containing only audio — which can be any codec: FLAC, AAC, Vorbis, Opus, AC3, DTS, or anything else the Matroska spec supports. Think of it as a universal audio container that doesn't care what's inside.
The format is uncommon compared to standalone audio formats (MP3, FLAC, M4A), but it appears in specific workflows: extracting audio from MKV files, archiving multichannel audio with chapter markers, or bundling multiple audio tracks (different languages) into a single file.
VLC and MPV play MKA files without issue. Foobar2000 handles them on Windows. For conversion, FFmpeg can extract audio from MKA into any standalone format. In practice, most people convert MKA to FLAC, M4A, or MP3 for compatibility with standard music players and streaming services.