Dark data is all the info companies collect but never use—think 60-80% of...

https://mag-wiki.win/index.php/What_is_Data_Curation_and_How_is_it_Different_from_Data_Classification%3F

Dark data is all the info companies collect but never use—think 60-80% of inactive data just sitting there. It matters because storing and managing this data costs money, sometimes up to $2.5 million a year for some businesses