This indicates the video resolution. 720p (1280 x 720 pixels) represents High Definition (HD) quality, offering a balance between clear visuals and manageable file sizes.
This specifies the source of the file. A "WEB-DL" is a file losslessly ripped from a streaming service (such as Amazon Prime, Netflix, or iTunes). It features no on-screen television logos or network watermarks, providing a clean viewing experience.
High Efficiency Video Coding (H.265), the compression standard used.