: A "Matroska" video container. MKVs are popular because they can hold multiple subtitle tracks and high-quality audio within a single file.
: "DesireMovies" and "Beauty" are tags from the specific groups or websites that encoded and uploaded the file to the internet. Why is this series popular? ep-456-al-ceboderl-s02-480p-hd-desiremovies-beauty-mkv
The file name ep-456-al-ceboderl-s02-480p-hd-desiremovies-beauty-mkv provides specific metadata used by online media communities: : A "Matroska" video container