Dark data is the inactive or unused information sitting in your systems—often...

https://dominicksbrilliantcolumn.bearsfanteamshop.com/how-do-i-prepare-unstructured-data-for-rag-pipelines

Dark data is the inactive or unused information sitting in your systems—often 60% to 80% of it. It quietly drains budgets, wastes about $2.5 million annually for some firms, and adds noise that confuses AI projects