High Efficiency Video Coding. This format allows for much higher data compression than the older H.264 (AVC) standard, meaning you get high quality in a significantly smaller file size.

A Matroska Multimedia Container, which can hold multiple video, audio, and subtitle tracks in a single file. Where to Watch Legally

If you are looking for a high-quality stream of Kuttey , it is officially available on major streaming platforms rather than unverified file-sharing networks: