What it is
Carbon Black watches process behaviour on an endpoint and reports what does not fit. A sensor on the machine supplies the events; the analysis runs in the cloud.
The difference from classic antivirus is the question being asked. Not “do I recognise this file”, but “why is this Office document starting PowerShell”.
What it is for
Estates that want not only to stop an incident but to reconstruct it. Much of the value is in the recording: after something happens, you can work out what happened.
That assumes somebody is looking. EDR with nobody assigned to it is a data store.
What changed
Broadcom’s acquisition of VMware moved the product into a different business unit. That changes little about the product in the short term and quite a lot about contracts and who you talk to. Check both before the next renewal.