Dark data is the information companies collect but never use—like old files,...

https://www.list-bookmarks.win/dark-data-is-the-information-your-company-collects-but-doesn-t-use-often

Dark data is the information companies collect but never use—like old files, emails, or logs. Studies show 60-80% of stored data sits inactive, costing businesses up to $2.5 million a year in wasted storage and management