Which AWS service uses a combination of publishers and subscribers?

Question

Options

• AAWS Lambda
• BAmazon Simple Notification Service (Amazon SNS)
• CAmazon CloudWatch
• DAWS CloudFormation

• B
  92% (22)
• C
  4% (1)
• D
  4% (1)

Explanation

Amazon SNS is built entirely around the publish/subscribe (pub/sub) messaging model, where publishers send messages to a central topic and subscribers (such as email endpoints, Lambda functions, or SQS queues) receive those messages - making it the definitive AWS pub/sub service.

Why the others are wrong:

• AWS Lambda (A) is a serverless compute service that runs code in response to events - it has no native publisher/subscriber architecture.
• Amazon CloudWatch (C) is a monitoring and observability service for metrics, logs, and alarms - not a messaging service.
• AWS CloudFormation (D) is an infrastructure-as-code service used to provision AWS resources via templates - unrelated to messaging patterns.

Memory Tip: Think of SNS like a newspaper publisher - the publisher prints one edition (the message/topic), and all subscribers (readers) receive it simultaneously. The "S" in SNS can remind you of "Send to Subscribers."

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