This stands for "Web Download." It means the video was sourced directly from a streaming service (like Netflix or iWantTFC). This is usually the highest quality available for digital releases, as there is no "on-screen" watermarking or recording interference.
"We can't stay here," Erika whispered, checking her phone. "The military is setting up a perimeter. They aren't coming in to save us; they’re coming to make sure nothing gets out." Block.Z.2020.720p.WEB-DL.AAC.x264-Mkvking
Directed by Mikhail Red, Block Z is a fast-paced action-horror film set in a university under quarantine. This stands for "Web Download
: The source of the file. This indicates it was "Downloaded" directly from a "Web" streaming service (like Netflix, iTunes, or Amazon) without being re-encoded, ensuring high quality. " Erika whispered