Comments are used to tell somebody about your program or as annotations to what each block of code represents and what variable is used for representation. They are written like a hashtag with a hash (also called an octothorpe or pound sign) at the beginning.

A comment is written like this:

#Hello World

This is a comment that is used to tell the reader that it is a hello world program. Python, unlike Java or C++, does not have documentation or multi-line comments. So you may have to type in a hashtag each time you write a comment.

Now, do something like this:

#A hello World program

print("Hello World")

And see what happens.

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