Which AWS service is designed to help users orchestrate a workflow process for a set of AWS Lambda functions?

Explanations:

Amazon DynamoDB is a NoSQL database service designed for high-performance data storage and retrieval, not for orchestrating workflows.

AWS CodePipeline is a continuous integration and continuous delivery service for automating build, test, and release processes, not specifically for orchestrating Lambda functions.

AWS Batch is a service that enables you to run batch computing workloads, but it does not provide workflow orchestration for AWS Lambda functions.

AWS Step Functions is specifically designed to coordinate and orchestrate workflows involving multiple AWS services, including AWS Lambda functions.