Answer
Amazon EventBridge is a fully managed serverless event bus service that makes it easy to connect applications together using events, letting you route events from sources such as your own applications, AWS services, or third party software as a service providers to targets like Lambda functions, without needing to write custom integration code between every pair of systems.
aws events put-rule --name 'OrderPlacedRule' --event-pattern '{"source":["myapp.orders"]}'Real-world example An online retailer publishes an order placed event to EventBridge whenever a customer completes checkout, and multiple independent services, such as inventory, shipping, and email notifications, each react to that single event without being directly connected to one another.