Which service allows for easy coordination of components in distributed applications?

AWS Step Functions is designed specifically to coordinate components of distributed applications by allowing developers to build complex workflows that integrate various AWS services and potentially external systems. This service provides a graphical interface where users can define workflows as state machines, which visually represent the various tasks that need to be performed and the order in which they should be executed.

Step Functions handle the complexity of managing the state and transitions between tasks, making it easier to create robust applications that can include retries, error handling, and parallel processing. By utilizing this service, developers can focus on the logic of their applications without being bogged down by the intricacies of managing the execution flow and state management.

In contrast, Amazon SQS primarily serves as a message queuing service, allowing components to communicate asynchronously but not coordinating the workflows themselves. Amazon Connect offers a cloud-based contact center solution and does not directly manage coordination of distributed application components. Similarly, Amazon SNS facilitates messaging and notification but lacks the capability to orchestrate and manage complex workflows like Step Functions does. Thus, AWS Step Functions stands out as the most suitable option for coordinating various components within distributed applications.