Dark data is all the info companies collect but never use—like old files or...

https://blast-wiki.win/index.php/What_is_the_Point_of_Regex_Patterns_for_Data_Governance%3F

Dark data is all the info companies collect but never use—like old files or unused logs. It can make up 60-80% of your stored data. This inactive info costs businesses millions each year in storage and management