Dark data is the stuff companies collect but never use—up to 80% of their...

https://source-wiki.win/index.php/What_is_%E2%80%9CAI-Ready_Data%E2%80%9D_and_How_Do_You_Get_There_from_File_Shares%3F

Dark data is the stuff companies collect but never use—up to 80% of their information just sits there. It matters because it takes up space, slows systems down, and can cost businesses millions every year in storage and missed insights