Dark data is the info companies collect but don’t use, often making up 60-80%...

https://nova-wiki.win/index.php/What_Does_%22Garbage_In,_Garbage_Out%22_Look_Like_in_Vector_Databases%3F

Dark data is the info companies collect but don’t use, often making up 60-80% of their stored data. It matters because keeping this inactive data costs money—some businesses waste up to $2.5 million a year on storage and management