Do yourself a favour and save the time you need to post - to check the manual for the additional information which is linked within the text, eg ...
StringCaseSense --> Expression comparison operators -->
Quote:
Equal (=) , case-sensitive-equal (==) , and not-equal (<> or !=). The operators != and <> are identical in function. The == operator behaves identically to = except when either of the inputs is not a number, in which case == is always case sensitive and = is always case insensitive (the method of insensitivity depends on StringCaseSense). By contrast, <> and != obey StringCaseSense. Note: A quoted literal string such as "55" is always considered non-numeric in this context.