Objective-C Additions

This section is a brief summary of the additions that Objective-C makes to C.

Runtime

Objective-C requires a runtime. The runtime is a dynamic link library of C functions that is provided on all systems that support Objective-C. It does the work of setting up and operating the Objective-C messaging system. The runtime does its work silently, behind the scenes. In normal circumstances, there is no need to interact with the runtime directly by calling one of its functions.