The detection rule titled 'Auth0: Impossible travel Sign-In' is designed to identify potential unauthorized access to user accounts based on suspicious login patterns associated with geographical discrepancies. This is achieved by analyzing user sign-ins from multiple distinct locations within a short timeframe and measuring the distance between those locations. By employing geolocation data derived from the source IP address of the logins, the rule assesses if a user logged in from two locations that are geographically far apart, exceeding a predetermined speed threshold based on the time between logins. If such conditions are met, it suggests that the login could be malicious, as it would be physically implausible for a user to travel that distance in the indicated timeframe.