Into Nod.js, the control flow function is a common code snippet, that executes whenever there are any asynchronous function calls made, and they are used to evaluate the order in which these functions are executed in Node.js.

These are following the order in which control flow statements are used to process function calls:

• Handling execution and queue 
• Data collection and storage
• Concurrency handling and limiting
• Execution of the next piece of code