Dark data is the inactive or hidden information lurking in your storage—often...

https://www.golf-bookmarks.win/dark-data-is-the-55-of-stored-information-companies-don-t-use-but-still-pay-to

Dark data is the inactive or hidden information lurking in your storage—often 55% of what companies keep. It’s not just taking up space; it’s costing you money and creating noise that confuses AI projects