Dark data is all the unused information companies collect but never analyze or...

https://stateofseo.com/what-does-agentless-really-mean-for-storage-analytics-tools/

Dark data is all the unused information companies collect but never analyze or use. It can be huge—about 60-80% of data sits inactive, hidden away. That unused data costs businesses up to $2.5 million a year in storage and management fees