H.264 + AAC in an MKV container is supported by almost every media player: VLC, MPC-HC, Plex, Kodi, iOS (via Infuse or VLC), Android (MX Player, VLC), smart TVs, game consoles, and more. You won’t need to convert the file or install obscure codecs.
The year indicates when the film was originally released theatrically or digitally. This helps distinguish it from any remakes, sequels, or other films with similar titles. Block.Z.2020.720p.WEB-DL.AAC.x264-Mkvking
While 1080p and 4K offer sharper images, 720p remains highly popular for several reasons: iOS (via Infuse or VLC)