Dark data is all the information companies collect but never use. It often...

https://astro-wiki.win/index.php/How_Can_Databricks_Find_the_Right_Files_Before_Ingestion%3F

Dark data is all the information companies collect but never use. It often makes up 60-80% of stored data. This unused info wastes storage space and can cost businesses up to $2.5 million a year in unnecessary expenses