Dark data is all the information your company collects but never uses—think...

https://remote-wiki.win/index.php/Should_I_Prioritize_Tiering_Cold_Data_or_Scanning_for_PII_First%3F

Dark data is all the information your company collects but never uses—think emails, old files, or outdated customer records. It’s estimated that 60 to 80% of an organization’s data sits inactive, quietly taking up space and costing money