Which AWS service uses a combination of publishers and subscribers?

Explanations:

AWS Lambda is a compute service that runs code in response to events but does not inherently use a publisher-subscriber model.

Amazon Simple Notification Service (Amazon SNS) is a fully managed messaging service that allows the use of a publisher-subscriber model, enabling asynchronous communication between services.

Amazon CloudWatch is primarily a monitoring and observability service and does not utilize a publisher-subscriber architecture.

AWS CloudFormation is a service for defining and provisioning AWS infrastructure as code and does not involve a publisher-subscriber model.