Dark data is the information organizations collect but never use. It can be 60...

https://www.golf-bookmarks.win/dark-data-is-the-55-of-stored-information-companies-don-t-use-but-still-pay-to

Dark data is the information organizations collect but never use. It can be 60 to 80% of your stored data, sitting idle and costing companies up to $2.5 million a year in storage and management