Dark data is all the information companies collect but don’t actively use—often...

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

Dark data is all the information companies collect but don’t actively use—often 60-80% of stored data sits inactive. It matters because holding onto this unused data wastes space and can cost businesses millions yearly, sometimes up to $2.5 million