We send you security alerts when we: Detect important actions in your account, like if someone signs in on a new device. Detect suspicious activity in your account, like if an unusual number of emails are sent. Block someone from taking an important action, like viewing stored passwords.

Default service accounts are user-managed service accounts that are created automatically when you enable or use certain Google Cloud services. These service accounts let the service deploy jobs that access other Google Cloud resources. You are responsible for managing default service accounts after they are created.

If you notice changes in your account settings that you did not make—such as forwarding emails to an unknown address, changes to your recovery information, or altered security settings—it's likely your account has been hacked.

Google Cloud projects form the basis for creating, enabling, and using all Google Cloud services including managing APIs, enabling billing, adding and removing collaborators, and managing permissions for Google Cloud resources.