""" Python is case sensitive ,means it treats both uppercase and lowercase as different things. mypy =5 MyPy=10 both `mypy` and `MyPy` are treated as 2 different variables. print(mypy) #5 print(MyPy) #10 Same for keywords, you can't use `Print` for `print` some languages are case insensitive. HTML is one of case insensitive languages. So here <header> and <HEADER> are same things. <h1> and <H1> are also same. In sql as well case doesn't matter. """ ~https://www.sololearn.com/discuss/2056912/?ref=app Abhishek Yadav , please change tags and remove the code link. add relevant tags only.