The "WEBRip" component is the first critical specification. It indicates the of the video file. Unlike a "WEB-DL" (Web Download), which is a direct digital copy of the stream from a platform like Netflix or Amazon Prime, a WEBRip is typically created by capturing or recording the video stream using screen capture software while it plays.
The primary reason to seek out the variant over older formats (like x264 or AVC) comes down to data compression efficiency. 1. Half the File Size, Same Quality Kairos S01 KOREAN WEBRip x265-ION265