string.join()

The `join()` method is a string method in Python that returns a string concatenated with the elements of an iterable object. The syntax for `join()` is as follows:

`string.join(iterable)`

Here, `string` is the string that will be used as a separator between the elements of the iterable, and `iterable` is the iterable object that contains the elements to be joined. The iterable can be a list, tuple, or any other sequence.

For example, let's say we have a list of strings:

my_list = ['Hello', 'world', 'how', 'are', 'you']

We can use the `join()` method to concatenate the elements of the list with a space separator:

my_string = ' '.join(my_list)

The resulting string would be:

'Hello world how are you'

Note that the separator (in this case, a space) is placed between each element of the iterable, except for the last element.