Dark data is the vast amount of information companies collect but never use —...

https://shanesexpertword.fotosdefrases.com/what-is-the-point-of-regex-patterns-for-data-governance

Dark data is the vast amount of information companies collect but never use — around 60-80% of it just sits inactive. This unused data takes up storage, slows down systems, and can cost businesses an average of $2.5 million each year