Dark data refers to the inactive or unused information stored in your files and...

https://www.charliebookmarks.win/dark-data-is-all-the-info-your-company-stores-but-never-uses-think-old-files-1

Dark data refers to the inactive or unused information stored in your files and systems. Around 55% of data falls into this category, which not only adds unnecessary storage costs but also creates risks like security gaps