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

https://www.wall-bookmarkings.win/dark-data-refers-to-the-55-of-stored-information-that-businesses-collect-but

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