Dark data is all the info a company collects but never uses—think emails, logs,...

https://www.emergbook.win/dark-data-is-the-information-companies-collect-but-never-use-it-s-estimated

Dark data is all the info a company collects but never uses—think emails, logs, or old documents. It can be as much as 60-80% of stored data. Ignoring this stuff wastes time and money—some firms lose up to $2.5 million a year on storage and management