Dark data is all the information companies collect but never use, like old...

https://cashsbrilliantperspectives.cavandoragh.org/what-does-garbage-in-garbage-out-look-like-in-vector-databases

Dark data is all the information companies collect but never use, like old files or unseen logs. It's huge—up to 80% of stored data can go untouched. That’s a big deal because managing this forgotten data can waste around $2.5 million each year