Purpose of @ Symbol Before Strings?

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It denotes a NSString (rather than a standard C string)

an NSString is an Object that stores a unicode string and provides a bunch of method to assist with manipulating.

a C string is just a \0 terminated bunch of characters (bytes).

EDIT: and the good reason is that Objective-C builds on top of C, the C language constructs need to be still available. @”” is an objective-c only extension.

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