What does this mean: *args, **kwargs? And why would we use it?

Basically *args is applied when you are not sure about the number of arguments that are going to be passed to a function, or if there arises a need to pass stored list or tuple of arguments to a function.

Whereas, **kwargs is used when you are unsure about the number of keyword arguments that will be passed to a function, or it can be also used to pass the values of a dictionary as keyword arguments. The identifier args and kwargs are a convention, you could also use *bob and **billy but that would not be wise.