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It was originally a system designed privately by Apple Inc, however with Mac OS X, it has been based on Unix.

People generally think of applications, but well briefly cover some of the other kinds.

Cocoa applications include: Finder, Mail, Address Book, Safari, Microsoft Word, and Microsoft Excel.

Anybody can develop applications using Apples free development tools which includes XCode.

Mac OS X applications are developed using Objective-C though there are other possible programming languages that could be used.

Objective-C includes everything that plain C can do, and adds object-oriented programming.

Using both Objective-C and C is called Objective-C and is considered to be optional when developing software for Mac OS X: C.

Objective-C entered Mac OS X and has ancestry in NeXT.

Cocoa. Before you learn Mac programming you must know the basics of C since it is the basis for Objective-C.

When Mac OS X first came out, users and developers had a huge investment in software written for Mac Classic OS and Mac OS X used to have an emulation mode so that users could run their old software.

Apple has long since stopped support of the Classic API and Classic emulation in Mac OS X.

Carbon was a great way that Apple provided developers to upgrade their software to run on Mac OS X without having to totally rewrite their software, but Carbon, like Classic, is no longer supported by Apple.

Cocoa is the most native API that can be used to develop applications for Mac OS X that are truly Mac-like.

Generally, Objective-C will be used along with Cocoa, though there are other options such as Cocoa-AppleScript and Cocoa-Python, but Cocoa-Objective-C is really the mainstream way to develop Cocoa applications.

This feature used to be used for Classic and Carbon applications to separate code from resources (such as menus, windows, etc.), and the Mac OS X file system still supports two forks, but you should only use the data fork.

The resource fork is non-standard and can be lost when transferring Mac files to other file systems.

AppleScript is a language that Apple invented to automate repetitive tasks.

The AppleScript application is located on your Mac at ApplicationsUtilitiesAppleScript Editor.

AppleScript can be used to record AppleEvents, the events that applications send to themselves or to other applications.

Open AppleScript Editor, press the record button, do some things with your other applications and watch the script write itself.

AppleScript can be used alone or it can be used along with XCode to develop Cocoa Applications using mostly AppleScript instead of Objective-C.

This option is mostly for experienced AppleScript programmers who dont know Objective-C.

It is possible to develop scripts for the command line.

Terminal.app is located at ApplicationsUtilitiesTerminal.app To create a shell script, you need a text editor.

There is a text editor that comes with Mac OS X called TextEdit.app.

It is located in ApplicationsTextEdit.app.

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But actually, what is better than TextEdit is a program such as TextWrangler.app which is available for free from the following link.

Coding App For Mac Os X