Dark data is the information companies collect but never use, like forgotten...

https://www.bookmarkingqueen.win/dark-data-is-the-information-companies-collect-but-never-use-often-55-of

Dark data is the information companies collect but never use, like forgotten old files or inactive records. It makes up about 60-80% of all stored data. This unused data takes up space, slows systems, and costs businesses up to $2