Which AWS service provides a fully managed message queuing service?

Amazon SQS, or Simple Queue Service, is the fully managed message queuing service provided by AWS. This service enables applications to send, store, and receive messages at any volume without losing messages. By using SQS, developers can decouple and scale microservices, distributed systems, and serverless applications.

SQS handles the provisioning, scaling, and maintenance of the message queuing system, allowing developers to focus on building their applications instead of managing the infrastructure required for messaging. It provides features such as FIFO (First-In-First-Out) queues to ensure that messages are processed in order and standard queues that allow for high throughput with the possibility of messages being processed out of order.

In contrast, the other services mentioned serve different purposes within the AWS ecosystem. Amazon S3 is primarily for object storage, Amazon RDS is a relational database service, and Amazon DynamoDB is a fully managed NoSQL database. Each of these services addresses different application needs, but none provide the message queuing capabilities that SQS offers.