Dark data is the information companies collect but never use. It can make up...

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

Dark data is the information companies collect but never use. It can make up 60-80% of stored data, taking up space and racketing up costs. Ignoring it wastes millions yearly, around $2.5 million on average