AWS SQS Amazon Simple Queue Service (SQS) is a fully managed message queuing service for decoupling microservices. It offers two queue types: Standard (best-effort ordering, at-least-once delivery) and FIFO (exactly-once, ordered). Core Concepts - Standard Queue — unlimited throughput, at-least-once delivery, best-effort ordering - FIFO Queue — exactly-once processing, strict ordering, 3000 msg/s with batching - Visibility Timeout — period a message is hidden after being received - Dead-Letter Queue (DLQ) — destination for messages that fail processing - Message Group ID — FIFO ordering key f…