What is the function of AWS Step Functions?

AWS Step Functions is a serverless orchestration service that allows you to coordinate multiple AWS services into resilient workflows. The primary function of Step Functions is to enable seamless communication and data input/output management between different AWS services during the execution of complex workflows. This is accomplished through a visual interface where you define the steps in your workflow, including any branching or error handling logic.

By facilitating the interaction between various AWS services, Step Functions helps to ensure that each component of your application can communicate effectively. This is particularly valuable in microservices architectures, where different parts of an application may need to interact with each other in a structured manner.

The other choices do not accurately represent the primary function of AWS Step Functions. While integrations with cloud storage or databases are important, those capabilities are not the main focus of Step Functions. Additionally, it is not primarily used for managing virtual machine instances or for creating serverless applications without code; instead, it provides a framework for managing and executing a series of steps that often involve calling various functions and services, which might include serverless applications, but also encompasses much more.