# Glossary for AWS User Notifications
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| Term | Definition | 
| --- | --- | 
| AWS managed notifications | An *AWS managed notification* is a notification that is generated by default. For example, notifications about payment updates. | 
| Event | An *event* indicates a change in an environment. AWS User Notifications uses Amazon EventBridge events to generate notifications. For example, an Amazon EC2 instance state changed to failed. | 
| Event pattern | An *event pattern* has the same structure as the events that they match. Rules use event patterns to select events and notify users. An event pattern either matches an event or it doesn't. | 
| Event rule | A *rule* matches incoming events and generates a notification. When you create rules for events, User Notifications notifies you when it receives an event that matches the event pattern in the rule. | 
| Notification Center | A dedicated user interface of the AWS Management Console where users can configure and view notifications. | 
| Notification configuration | A logical container of event rules. | 
| Notification hub | An account-level setting that you use to select the Regions where you want to store, process, and replicate your notifications. | 
| User-Configured Notification | A *user-configured notification* is a notification generated by a user's notification configuration. |