Dark data is the information your company collects but never uses—it’s...

https://hotel-wiki.win/index.php/Komprise_Analysis_vs_Other_File_Analytics_Tools:_What_Sets_It_Apart%3F

Dark data is the information your company collects but never uses—it’s estimated that 55% of data falls into this category. This inactive data takes up storage space, driving up costs and increasing security risks