Dark data is the information your company collects but never uses—it’s...

https://mag-wiki.win/index.php/Dark_Data_and_AI_Governance:_What_Should_Be_Blocked_from_Ingestion%3F

Dark data is the information your company collects but never uses—it’s estimated that 55% of data falls into this category. This inactive data takes up storage space, driving up costs and increasing security risks