Which service serves as a serverless orchestration service that coordinates AWS services to build resilient workflows?

• A. Wolfram Alpha
• B. Amazon AppFlow
• C. AWS Step Functions
• D. Amazon OpenSearch Service

Answer: (C)

Coordinating multiple AWS services to run in a defined sequence with built-in state, retry logic, and fault tolerance is what orchestration in a serverless fashion is all about. AWS Step Functions serves exactly this role. It lets you build workflows as state machines where each step can trigger AWS services like Lambda functions, ECS tasks, Glue, SageMaker, or others, and it manages the flow, retries, timeouts, and branching without you managing servers. This makes complex, long-running, or multi-service processes reliable and scalable, since the service provides persistent state, visual monitoring, and automatic retry or fallback paths when something goes wrong.

In practice, you can design a workflow that validates input with a Lambda, processes data with Glue, runs a machine learning job in SageMaker, and then sends notifications or stores results, with precise control over what happens on failures and how to recover. The key strength is that orchestration is serverless and integrated with AWS services, so you can build resilient end-to-end workflows without provisioning or managing servers.

Wolfram Alpha is a computational knowledge engine and not tied to AWS service orchestration. Amazon AppFlow focuses on transferring data between SaaS apps and AWS services rather than coordinating AWS tasks in a workflow. Amazon OpenSearch Service provides search and analytics capabilities for data and does not orchestrate multi-service workflows.