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

https://www.bookmarking-planet.win/dark-data-is-the-info-companies-keep-but-never-use-think-old-files-logs-or

Dark data is all the information companies collect but never use—between 60-80% of stored data often sits inactive. This unused data adds clutter, increases storage costs, and can hide risks like compliance issues