: This confirms that the file includes subtitles , which are either hardcoded into the video or included as a selectable track.
: This is often a tracker ID or a specific release number used by the group that uploaded the file. 7363-BR720p-SUBS-HOWTOTRAINDRAGON3.mp4
: The file container format, which is universal and works on almost any device (phones, TVs, computers). The End of an Era: A Look at The Hidden World : This confirms that the file includes subtitles
: The resolution (1280x720 pixels). It is considered "High Definition," offering a balance between clear picture quality and a smaller file size compared to 1080p or 4K. 7363-BR720p-SUBS-HOWTOTRAINDRAGON3.mp4