Dark data is the information companies collect but never use, like forgotten...

https://blogfreely.net/samuel-wang09/how-do-you-run-a-deletion-workflow-without-getting-sued-later

Dark data is the information companies collect but never use, like forgotten old files or inactive records. It makes up about 60-80% of all stored data. This unused data takes up space, slows systems, and costs businesses up to $2