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AWS Step Functions is particularly well-suited for orchestrating microservices because it is designed to handle complex workflows and integrate various services seamlessly. This service allows you to coordinate multiple AWS services into serverless workflows, managing the interactions among them through visual workflows. Each state in the workflow can represent a step in the process, enabling developers to build and visualize the flow of data and the transitions between microservices.

Moreover, AWS Step Functions supports error handling, retries, and parallel task execution, which are essential for microservices architecture, where services need to communicate and operate together reliably. By defining workflows with states, you can ensure that your microservices can be easily coordinated with minimal manual intervention, enhancing the overall efficiency and scalability of your application.

While AWS CloudFormation is focused on infrastructure as code and AWS Lambda is primarily for running code without provisioning servers, and AWS CodeDeploy deals with automated application deployment, none of these services provide the specific workflow orchestration capabilities that Step Functions offers, making it the optimal choice for orchestrating microservices.