What is the primary function of Amazon SQS FIFO queues?

The primary function of Amazon Simple Queue Service (SQS) FIFO (First-In-First-Out) queues is to ensure strict message ordering and exactly-once processing. This feature is particularly important in scenarios where the order of operations is critical, such as in financial transactions or task scheduling where the sequence directly affects outcomes.

FIFO queues maintain the order in which messages are sent and received, so if Message A is sent before Message B, Message A will be processed before Message B. Additionally, FIFO queues are designed to handle exactly-once processing, which means each message is delivered only once and in the order that was intended, helping to mitigate issues such as duplicates.

The importance of these attributes becomes clear in applications that rely heavily on the sequential processing of events. In contrast, while high throughput, event-driven architecture, and data ingestion are valuable features of other AWS services, they do not specifically pertain to the unique characteristics of FIFO queues. Thus, the focus on strict ordering and exactly-once delivery makes this option the correct choice among the alternatives provided.