Web DL = Web Download. This is a video file sourced directly from a streaming service’s servers (e.g., Netflix, Amazon Prime, Hulu, Peacock, iTunes). Unlike a Webrip (which is screen-recorded), a Web DL is the original streamable file, often decrypted and remuxed.
= 1280×720 pixels progressive scan. It’s high-definition but not full HD (1080p) or 4K.