Dark data is the inactive or unused information sitting untouched in your...

https://www.pop-bookmarks.win/dark-data-is-the-unused-information-sitting-in-your-servers-and-storage-about

Dark data is the inactive or unused information sitting untouched in your systems—often making up 60%-80% of your stored files. It matters because it wastes space, drives up costs, and creates noise that can confuse AI projects