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

https://brookssniceop-ed.bearsfanteamshop.com/is-dark-data-the-same-thing-as-unstructured-data

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