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This document is about the first component of the development environment—the programminglanguage and its runtime environment. It fully describes the Objective-C language, and provides afoundation for learning about the second component, the Mac OS X Objective-C applicationframeworks—collectively known as Cocoa. You can start to learn more about Cocoa by reading GettingStarted with Cocoa. The two main development tools you use are Xcode and Interface Builder, describedin Xcode 2.0 User Guide and Interface Builder respectively. The Objective-C language is a simple computer language designed to enable sophisticatedobject-oriented programming. Objective-C is defined as small but powerful set of extensions to thestandard ANSI C language. Its additions to C are mostly based on Smalltalk, one of the firstobject-oriented programming languages. Objective-C is designed to give C full object-orientedprogramming capabilities, and to do so in a simple and straightforward way.