What is Objective C? Objective-C is a general-purpose, object-oriented programming language that adds Smalltalk-style messaging to the C programming language. It was the primary programming language used for macOS, iOS, watchOS, and tvOS development until the introduction of Swift in 2014. Objective-C was created by Brad Cox and Tom Love in 1984 as a way to add object-oriented features to the C programming language. It was originally used for the NeXTSTEP operating system, which was later acquired by Apple. Objective-C