Objective-C

Objective-C is the primary programming language, used when writing software for OS X and iOS. It’s a superset of the C programming language that provides object-oriented capabilities and a dynamic runtime. Objective-C inherits the syntax, primitive types, and flow control statements of C and adds syntax for defining classes and methods.

It also adds language-level support for object graph management and object literals while providing dynamic typing and binding, deferring many responsibilities until runtime.