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

https://www.charliebookmarks.win/dark-data-is-the-inactive-or-unused-information-organizations-keep-but-don-t

Dark data is the information companies store but never use. It can make up 60-80% of all data, quietly taking up space and resources. Ignoring it costs businesses an average of $2.5 million every year in wasted storage and missed opportunities