what is pascal case and what is camel case ?

Answer 1

Pascal case: MyVariable
Camel case: myVariable

Answer 2

Pascal gets all first letter in caps. camel gets first one lowercase then all in caps. MyVariable and myVariable

Answer 3

Pascal and Camel case are variable naming rules which improves code readability for you and other programmers or people reading your code. They are all fine to use, you can choose the one which bests suits you.