This is a High Definition (HD) video resolution in a Matroska container format, which allows for multiple audio and subtitle tracks.
Often available for digital rental in various regions. Understanding the File Tags
Indicates the audio track is an "original" Bengali dub rather than a fan-made voiceover.
Always ensure your device has a compatible media player, such as VLC Media Player , to handle MKV files and switch between audio tracks if the file is multi-language.
These are typically tags for the release groups or websites that uploaded the file.