What is the meaning of case sensitivity?

Case sensitive means that it matters if characters are in lower or uppercase , while case insensitive applications do not care about that. Are search engines case sensitive? No, search engines do not distinguish between queries in lower and uppercase. One exception are Boolean operators.

Definition of case-sensitive : requiring correct input of uppercase and lowercase letters Having the Caps Lock key on accidentally can also lead to a frustrating series of “wrong password” alerts when trying to use a case-sensitive password for your office network or Internet provider.—

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