Normally used to create one-line comments or to disable the interpretation of some code

# this is a comment
print("Hello world!") # This is another comment
# print("blah blah blah")

Normally used to create multi-line comments to explain complex code

""" This is a multi-line comment that
    explains what come complex code
    is doing that can't be done in
    1 or 2 lines"""
print("Hello world!")