To know what is a pass statement and how it works, let's suppose you are creating a class with some methods those you do not want to implement at the time of creating the class.
print ("I am in method_B function")
So in the above code, I have not used method_A() function so I have written pass statement in the function block so that it will be skipped to the next line of code without affecting the code. If I have not used pass statement it would have thrown an error.
IndentationError: expected an indented block
In one word if you want to define the pass statement then you can say that it is a placeholder.
To know more about this you can have a look at the following video tutorial:-