Impossible Travel
Noun · Security & Infosec
Definitions
A detection scenario where the same account appears to log in from geographically distant locations within a time window too short for legitimate travel. Impossible-travel alerts are common in identity security, though they can be noisy because of VPNs, proxies, and mobile-network routing.
In plain English: A login pattern that suggests an account appeared in two far-apart places too quickly to be real.
Example: "The impossible travel alert showed the account logging in from London and Singapore within thirty minutes."