meaning of functions in python code example

Example 1: how to define function in python

def example():			#This defines it
  print("Example.")		#This is the defined commands

example()				#And this is the commands being run

Example 2: function used in python

def hello():
  name = str(input("Enter your name: "))
  if name:
    print ("Hello " + str(name))
  else:
    print("Hello World") 
  return 
  
hello()