Chapter 3. Objective-C
Once upon a time a man named Brad Cox decided that it was time for the world to move toward a more modular programming style. C was a popular and powerful language. Smalltalk was an elegant untyped object-oriented language. Starting with C, Brad Cox added Smalltalk-like classes and message-sending mechanisms. He called the result Objective-C. Objective-C is a very simple extension of the C language. In fact, it was originally just a C preprocessor and a library.
Objective-C is not a proprietary language. Rather, it is an open standard that has been included in the Free Software Foundation's GNU C compiler (gcc) for many years. Cocoa was developed using Objective-C, and most Cocoa programming is done in Objective-C.