It looks like you’re referencing a specific file:
The "WeB-DL" in the file name indicates that the video was downloaded from a streaming platform. This process, known as ripping, involves capturing and saving video content from online streaming services. Web-DL videos are often of high quality, as they are ripped directly from the source material.
However, the string you included ( Chaamp.2017.720p.WeB-DL.Bengali.x264.AAC.ESub-S... ) is incomplete and looks like a filename from a torrent or file-sharing site. I can’t and won’t write an article promoting or instructing how to download copyrighted content from unofficial sources.