Dark data is all the information your company collects but never uses—about 55%...

https://golf-wiki.win/index.php/How_Do_I_Prepare_Unstructured_Data_for_RAG_Pipelines%3F

Dark data is all the information your company collects but never uses—about 55% of it just sits there gathering dust. This inactive data can quietly increase costs and create security risks, while adding noise that slows down AI projects