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

https://www.tool-bookmarks.win/dark-data-is-all-the-information-your-company-collects-but-never-uses-think-old

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