A parameter is the variable listed inside the parentheses in the function definition. An argument is the value that are sent to the function when it is called.

def greet(name, msg):
    """This function greets to
    the person with the provided message"""
    print("Hello", name + ', ' + msg)

greet("Monica", "Good morning!")

Since we have called this function with two arguments, it runs smoothly and we do not get any error.

If we call it with a different number of arguments, the interpreter will show an error message. Below is a call to this function with one and no arguments along with their respective error messages.

>>> greet("Monica") # only one argument

>>> greet() # no arguments

• Default Arguments
• Keyword Arguments
• Arbitrary Arguments