Dark data is the information companies collect but never use—often 60 to 80% of...

https://www.pure-bookmark.win/dark-data-is-the-inactive-or-unused-information-organizations-keep-but-don-t

Dark data is the information companies collect but never use—often 60 to 80% of their stored data. It’s like having a cluttered attic filled with stuff that costs money to store but offers no value