what does case sensitive mean and if u can translate it in arabic it will be better IF

Answer 1

Capital letters are called upper case letters and small letters are called lower case letters. So case sensitive means that the compiler takes two different variables if the cases are different even if the names are same. So age, Age, AGE, aGe are all different variables as it is case sensitive.

Answer 2

Case sensitive is about capital or non capital letters. Some programs/languages.../ are non case sensitive. Lets take an example with a variable.
#include <iostream>
using namespace std;
Int main()
{
int name,Name;
}
name is not the same as Name because of case sensitive.
If they were non case sensitive, then no matter how you write name,if it has these four letters.