Event Relay Connection to a Partner Event Source
After configuring the event relay in Salesforce, the event relay creates a partner event source in EventBridge. You associate the partner event source with an event bus. After you start the event relay in Salesforce, the event bus in EventBridge receives the events published and relayed from the Salesforce event bus. You can process the received events using AWS services.
Form more information, see Amazon EventBridge Partner Onboarding Guide in the AWS documentation.