This is the gold standard for high-quality downloads. MKV is a "container" that can hold unlimited video, audio, and subtitle tracks in one file. If you want multiple language options or high-definition (HD) quality, MKV is usually the best choice.
Unofficial downloads often feature "CAM" rips (recorded in a cinema) or files with out-of-sync audio and hardcoded subtitles. This is the gold standard for high-quality downloads
A free, open-source player that can play MKV, MP4, and AVI files without needing extra "codecs." open-source player that can play MKV
Most major streaming platforms now offer official "Download" features for PC and mobile apps. This is the safest way to watch web series in 720p or 1080p without risking your computer's health: This is the gold standard for high-quality downloads