use of the def in the function in the python code example

Example 1: python function

def my_function():
  print("Hello from a function")


  my_function()

Example 2: how to make a function in python

def your_function(arg1, arg2, arg3):
  do_something
  do_something_else

#to call the function (make it run):

your_function(something, something, something)