Dark data is all the information companies collect but never use—about 60-80%...

https://www.bookmarkingvictor.win/dark-data-is-the-info-companies-collect-but-rarely-use-about-60-80-of-all

Dark data is all the information companies collect but never use—about 60-80% of it just sits untouched. This hidden data piles up quietly, causing clutter and driving up storage costs