Dark data is the information companies collect but never use. It can be 60-80%...

https://rapid-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 be 60-80% of their stored data, taking up space and costing money to manage. This unused data creates risks and slows down systems