This detection rule monitors AWS CloudTrail logs to identify when a new public Amazon RDS (Relational Database Service) instance is restored from a snapshot. Specifically, it looks for events where the `eventSource` is `rds.amazonaws.com`, the `eventName` is `RestoreDBInstanceFromDBSnapshot`, and the instance is marked as `publiclyAccessible`. The creation of a publicly accessible database instance could indicate potential data exfiltration activities, hence it is marked with a high severity level. The rule is relevant for cloud security teams aiming to protect sensitive information stored in cloud databases from unauthorized access and potential leakage. The rule should be monitored closely for signs of misconfigurations or malicious intent.