Dark data is all the information your company keeps but rarely uses—around 55%...

https://www.bookmarking-planet.win/dark-data-is-the-information-stored-but-rarely-used-often-making-up-55-of-a

Dark data is all the information your company keeps but rarely uses—around 55% of it just sits idle. This hidden data adds unnecessary costs, creates security risks, and clutters AI systems with noise