The iOS SDK Tools
Xcode typically runs a few gigabytes in size and installs an integrated suite of interactive design tools onto your Macintosh. This suite consists of components that form the basis of the iOS development environment and includes the following parts:
Project Editor—This is the heart of Xcode and provides a home for most of the features, including project file and component management, syntax-aware source editing for both the Objective-C language and iOS SDK, as well as a visual editor and a full debugger. A separate window gives access to the full range of documentation for iOS, Xcode, and other supporting documentation.