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

https://gregorysbrilliantchat.lucialpiazzale.com/what-is-rot-data-and-how-is-it-related-to-dark-data

Dark data is the information companies collect but never use. It often makes up 60-80% of stored data, quietly taking up space and costing businesses millions—sometimes $2.5 million annually