Data breach
When we talk about data breaches, we ultimately mean the improper removal of data from where it should have been. But the circumstances matter and can alter the terminology we use to describe a particular incident.
A data breach is when protected data was confirmed to have improperly left a system from where it was originally stored, and usually confirmed when someone discovers the compromised data. More often than not, we’re referring to the exfiltration of data by a malicious cyberattacker, or otherwise detected as a result of an inadvertent exposure. Depending on what is known about the incident, we may describe it in more specific terms where details are known.