What does the `join()` method do in arrays?

The join() method in arrays is used to convert the elements of an array into a single string, where each element is separated by a specified separator. By default, if no separator is provided, it uses a comma. This method iterates over each element in the array, concatenating them into a string format which is particularly useful when you want to create a displayable representation of the array's contents. For example, if you have an array of names like ["Alice", "Bob", "Charlie"] and you call join(", ") on it, the resulting string will be "Alice, Bob, Charlie".

This method is distinct from operations that combine or modify the array itself, such as adding or removing elements, making it a powerful tool for formatting output rather than altering the original array structure.