Objective-C

Objective-C is a high-level, object-oriented programming language that was developed in the early 1980s. It is primarily used for developing applications for Apple's macOS and iOS operating systems. Objective-C is an extension of the C programming language and adds support for object-oriented programming features such as classes, methods, and inheritance.

Objective-C was originally developed by Brad Cox and Tom Love at Stepstone Corporation. It was later acquired by NeXT Computer, where it was used as the primary programming language for the NeXTSTEP operating system. When NeXT was acquired by Apple in 1997, Objective-C became the primary language for developing applications for macOS and iOS.

Objective-C is known for its dynamic runtime system, which allows for features such as method swizzling and dynamic class loading. It also supports a message-passing syntax, which allows objects to communicate with each other in a highly dynamic way.

In recent years, Objective-C has been largely supplanted by Apple's newer programming language, Swift. However, Objective-C is still widely used in legacy code and in certain specialized applications.