Username case sensitive

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.

case insensitive (not comparable) (computer science) Treating or interpreting upper- and lowercase letters as being the same .

Passwords are case sensitive . If you create a password with the password of “REST”, then the entering the password of “rest” in your email client/program, will result in an error.