EventBridge receives an event, an indicator of a change in environment, and applies a rule to route the event to a target. Rules match events to targets based on either the structure of the event, called an event pattern, or on a schedule. For example, when an Amazon EC2 instance changes from pending to running, you can have a rule that sends the event to a Lambda function.
All events that come to EventBridge are associated with an event bus. Rules are tied to a single event bus, so they can only be applied to events on that event bus. Your account has a default event bus which receives events from AWS services, and you can create custom event buses to send or receive events from a different account or Region.
When an AWS Partner wants to send events to an AWS customer account, they set up a partner event source. Then the customer must associate an event bus with the partner event source.
EventBridge API destinations are HTTP endpoints that you can set as the target of a rule, in the same way that you would send event data to an AWS service or resource. By using API destinations, you can use REST API calls to route events between AWS services, integrated SaaS applications, and your applications outside of AWS. When you create an API destination, you specify a connection to use for it. Each connection includes the details about the authorization type and parameters to use to authorize with the API destination endpoint.
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