Dark data is information your business collects and stores but doesn’t use—up...

https://www.save-bookmarks.win/dark-data-is-the-information-your-company-collects-but-never-uses-it-can-make

Dark data is information your business collects and stores but doesn’t use—up to 55% of all data. This can increase your risk of ransomware attacks and data breaches since you’re unknowingly exposing unused files