Indicates a high-definition resolution (1280x720 pixels) sourced from an official Blu-ray disc.

The Matroska Multimedia Container format, which can hold multiple video, audio, and subtitle tracks in a single file. How to Watch or Download Safely

The file name you mentioned follows a standard naming convention used in online file sharing:

Refers to the High Efficiency Video Coding codec, which provides high quality at significantly smaller file sizes compared to older formats.