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

https://page-wiki.win/index.php/How_Can_I_Query_NAS_File_Metadata_in_Databricks%3F

Dark data is all the info your company collects but never uses—up to 55% of it. This inactive data isn’t just wasting storage; it can cost you millions and create noise that confuses AI systems