Dark data is the information companies collect but never use. It can be old...

https://www.strobe-bookmarks.win/dark-data-is-the-info-companies-collect-but-never-use-often-making-up-60-80-of-1

Dark data is the information companies collect but never use. It can be old emails, logs, or files sitting idle—often making up 60 to 80 percent of stored data. This unused data costs businesses millions annually in storage and missed opportunities