What is case sensitive

Answer 1

Case sensitive means if you wrote a word one with capital and the other with small you may not get same result one may work or the other won't, like passcode https://en.m.wikipedia.org/wiki/Case_sensitivity

Answer 2

When you declare a variable ,for example name,you can not reuse it with other typing as Name or nAme or namE.c++ is case sensitive so name with lower case is not the same as Name or NAME with upper case.

Answer 3

likhith vathada
A and a both can't be same even they are same but one is small and one is in capital so it is called case sensitive.
For example, your name likhith can't be equal to Likhith.