Dark data is all the information companies collect but never use—about 60-80%...

https://www.phone-bookmarks.win/dark-data-is-all-the-information-your-business-collects-but-never-uses-often-60

Dark data is all the information companies collect but never use—about 60-80% of it just sits untouched. This hidden data piles up quietly, causing clutter and driving up storage costs