Why is programming case-sensitive?

Case-insensitive means the string which you are comparing should exactly be the same as a string which is to be compared but both strings can be either in upper case or lower case . ( ie., different cases)

From the point of view of the language syntax, you can force certain identifiers to start with a lower or upper case (for instance Java class name). That makes parsing easier, and hence helps keeping the syntax clean.

In computers, case sensitivity defines whether uppercase and lowercase letters are treated as distinct (case-sensitive) or equivalent (case-insensitive). For instance, when users interested in learning about dogs search an e-book, “dog” and “Dog” are of the same significance to them .