what does / output in python code example

Example 1: how to return an output to a function in Python

''' if you don't know def can make a function, 
I am making a simple squaring function to explain''' 
# space after parentisis is needed
def square(x) :
  s = x*x
  # do it with the return keyword!
  return s

Example 2: output something in python

print("Hello World!")

>>> Hello World!