Dark data is the stuff companies collect but never use—up to 80% of their...

https://www.a1bookmarks.win/dark-data-is-the-inactive-or-unused-information-stored-across-your-systems

Dark data is the stuff companies collect but never use—up to 80% of their information just sits there. It matters because it takes up space, slows systems down, and can cost businesses millions every year in storage and missed insights