Dark data is the info companies collect but never use—like old files or logs....

https://www.bookmarkidea.win/dark-data-is-the-information-companies-store-but-never-use-up-to-55-of-all

Dark data is the info companies collect but never use—like old files or logs. Up to 80% of stored data can be inactive, creating storage costs and security risks. It also clutters AI systems with useless noise, making insights harder to get