Dark data is all the information companies collect but never use—often making...

https://www.adirs-bookmarks.win/dark-data-is-the-stuff-companies-collect-but-never-use-up-to-80-of-their

Dark data is all the information companies collect but never use—often making up 60-80% of stored data. It matters because holding onto this inactive data wastes money and space, sometimes costing businesses over $2.5 million a year