These are the "release groups" or "trackers." YIFY (also known as YTS) is legendary in the digital space for providing high-quality movies at incredibly small file sizes, while TGx (TorrentGalaxy) is a major hub for contemporary digital releases. The Appeal of the 1080p WEBRip
For most viewers, the 1080p WEBRip is the "Goldilocks" of movie files. It offers a significantly better experience than 720p or standard definition, but it doesn't require the massive storage space or high-end hardware needed for 4K Ultra HD.
This indicates the source. A WEBRip is captured from a streaming service (like Amazon Prime or Netflix). Unlike a "WEB-DL," which is a direct file download, a WEBRip is often re-encoded, though modern standards ensure the quality loss is virtually indistinguishable to the human eye.