Dark data is the information your company stores but never uses—think 55% of...

https://star-wiki.win/index.php/What_Is_Agentic_AI_and_Why_Does_Dark_Data_Make_It_Risky%3F

Dark data is the information your company stores but never uses—think 55% of your files just sitting there. It matters because keeping that unused data racks up storage costs and risks, like data breaches