Dark data is the untapped information sitting in your files and systems that no...

https://direct-wiki.win/index.php/Dark_Data_vs_Shadow_IT_%E2%80%93_What_Should_I_Tackle_First%3F

Dark data is the untapped information sitting in your files and systems that no one uses — and it can cause real problems. Around 55% of stored data goes unused, which means you’re paying for storage and risking exposure without any benefit