p-each-series sequentially iterates over an iterable of promises, executing an asynchronous function for each element. Unlike Promise.all, it runs promises in series, one after another, guaranteeing order. This is useful when dealing with rate limits or when each promise depends on the completion of the previous one. It simplifies asynchronous control flow and provides a cleaner, more maintainable alternative to manual promise chaining. It receives an iterable and an asynchronous function for execution.