If you are curious about what the specific terms in your query mean:

A "Matroska" video container that can hold multiple subtitle and audio tracks.

Official platforms allow you to toggle between SD, HD, and 4K quality depending on your internet speed, providing a much better experience than the compressed "100MB" versions found online. Decoding the File Name

This indicates a "heavily compressed" file, which usually results in lower audio and video clarity compared to the original broadcast.