Which AWS service implements a publish–subscribe model using publishers and subscribers?
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Correct answer: Amazon Simple Notification Service (Amazon SNS).
Why this is the answer
Amazon Simple Notification Service (Amazon SNS) is a fully managed messaging service that enables you to decouple microservices, distributed systems, and serverless applications. It uses a publish-subscribe model where publishers send messages to a topic, and subscribers receive those messages. This allows for asynchronous communication and fan-out messaging to multiple endpoints like SQS queues, Lambda functions, HTTP/S endpoints, and email. AWS Lambda is a serverless compute service, not a messaging service. Amazon CloudWatch is a monitoring and observability service. AWS CloudFormation is an infrastructure as code service for provisioning AWS resources.
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