In plain English
This means the account is showing behavior that does not match how it usually acts. The change from its normal pattern matters because it can suggest that someone without permission may be using it.
In context
Here, "unusual activity" flags that the account's behavior is outside its normal pattern and may indicate possible unauthorized use.
- Situation
- Responding to phishing, suspicious activity, fraud, and compromise alerts
- What it communicates
- flags account behavior as out of the ordinary.
Meaning limits
By itself, the term does not confirm that unauthorized use has actually occurred.
Examples
“Her account showed unusual activity when several late-night orders came from a city she had never visited.”
“Customer support asked her to review the unusual activity on her account.”