Which AWS service is a pull service and which is a push service?

In AWS, Amazon Simple Notification Service (SNS) is a push‑based messaging service. When a message is published to an SNS topic, SNS immediately pushes the message to all subscribed endpoints (e.g., email, SMS, Lambda, SQS). In contrast, Amazon Simple Queue Service (SQS) is a pull‑based service. Producers send messages to an SQS queue, but consumers must explicitly poll the queue to retrieve messages. This pull model allows consumers to control the rate of consumption and provides features like visibility timeouts and dead‑letter queues. Therefore, SNS is the push service, and SQS is the pull service.