An application requires sending, storing, and receiving messages between components, and it must process messages in first-in, first-out (FIFO) order. Which AWS service should be used?

Amazon SQS is a fully managed message queuing service that enables you to decouple and scale microservices, distributed systems, and serverless applications. It supports both standard queues and FIFO (First-In, First-Out) queues. FIFO queues guarantee that messages are processed exactly once, in the exact order they are sent, which directly addresses the requirement for FIFO processing. AWS Step Functions is a serverless workflow service for orchestrating complex workflows, not primarily for simple message queuing. Amazon SNS is a pub/sub messaging service used for sending messages to multiple subscribers, not for maintaining a strict FIFO order between individual components. Amazon Kinesis Data Streams is a real-time data streaming service, suitable for continuous data ingestion and processing, but SQS FIFO is the more direct and cost-effective solution for guaranteed ordered message delivery between application components.