Core Services
Encyclopedia
Core Services are a set of Mac OS X
Mac OS X
Mac OS X is a series of Unix-based operating systems and graphical user interfaces developed, marketed, and sold by Apple Inc. Since 2002, has been included with all new Macintosh computer systems...

 and iOS application programming interface
Application programming interface
An application programming interface is a source code based specification intended to be used as an interface by software components to communicate with each other...

s that architecturally are underneath Carbon
Carbon (API)
Carbon is one of Apple Inc.'s procedural application programming interfaces for the Macintosh operating system. It provides C programming language access to Macintosh system services...

, Cocoa
Cocoa (API)
Cocoa is Apple's native object-oriented application programming interface for the Mac OS X operating system and—along with the Cocoa Touch extension for gesture recognition and animation—for applications for the iOS operating system, used on Apple devices such as the iPhone, the iPod Touch, and...

 and Cocoa Touch
Cocoa Touch
Cocoa Touch is an API for building software programs to run on the iPhone, iPod Touch, and iPad from Apple Inc.Cocoa Touch provides an abstraction layer of iOS, the operating system for the iPhone, iPod Touch, and iPad. Cocoa Touch is based on the Mac OS X Cocoa API toolset and, like it, is...

. In addition to Core Foundation
Core Foundation
Core Foundation is a C application programming interface in Mac OS X & iOS, and is a mix of low-level routines and wrapper functions...

, it also encompasses other APIs including Grand Central Dispatch, Blocks
Blocks (C language extension)
Blocks are a nonstandard extension added by Apple Inc. to the C, C++, and Objective-C programming languages that uses a lambda expression-like syntax to create closures within these languages...

, CFNetwork, CarbonCore, OSServices, and WebServicesCore.
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