Dark data is the untouched information stored in your systems—up to 55% of all...

https://www.yankee-bookmarkings.win/dark-data-is-the-inactive-or-unused-information-stored-away-and-overlooked

Dark data is the untouched information stored in your systems—up to 55% of all data goes unused. This matters because it racks up costs and creates risk, especially when AI sifts through cluttered files