Dark data is the information your company collects but never uses—up to 55% of...

https://yenkee-wiki.win/index.php/What_Should_We_Delete_First_When_Cleaning_Up_Dark_Data%3F

Dark data is the information your company collects but never uses—up to 55% of all data. This unused data takes up space, wastes about $2.5 million in storage costs, and creates noise that can confuse AI systems