: This suggests the post or folder contains multiple resolution options.
: The "tag" for the group or website that encoded and uploaded this specific version. Why This Version? : This suggests the post or folder contains
: The source of the video. This indicates the file was ripped from an official physical Blu-ray disc, offering much higher bitrates and better image stability than a "WebRip" or "Cam" version. : This suggests the post or folder contains
720p : High definition (HD), a balance of quality and file size. 1080p : Full HD, best for large monitors or TVs. : This suggests the post or folder contains
Here is a "look under the hood" at what each part of that filename means for a viewer: