Amazon EventBridge overview
Amazon EventBridge is a serverless event-driven bus that makes it easy to ingest and process data from a variety of sources. These sources include AWS services, your applications, and third-party SaaS providers. It removes the discord of writing point-to-point integrations between services. EventBridge is a managed service from AWS. This means that you don't need to worry about having to provision more or less of the service as your needs fall and rise. The EventBridge service takes care of this for you:
An Event Source can be almost any of the AWS services, custom applications, or SaaS applications.
For SaaS applications, there is special support for partner applications called an Event Source. This Event Source provides a logical connection between the third-party SaaS provider and your AWS account, without the need to provision any cross-account IAM roles...