Dark data is the vast amount of information companies store but never use—up to...

https://www.apu-bookmarks.win/dark-data-is-the-information-companies-collect-but-never-use-often-making-up-2

Dark data is the vast amount of information companies store but never use—up to 80% can sit inactive. It matters because this unused data costs businesses around $2.5 million every year in storage and management