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Objective-C is a programming language that is commonly used for developing software applications for Apple's macOS and iOS operating systems. It is an object-oriented language that is based on the C programming language. Objective-C was the primary programming language used by Apple before the introduction of Swift in 2014.

Objective-C combines the features of C with Smalltalk, a programming language known for its object-oriented capabilities. It provides a dynamic runtime environment, which allows for features such as dynamic typing and late binding. Objective-C also supports message passing between objects, which is a key aspect of its object-oriented nature.

Objective-C is known for its use of square brackets to send messages to objects. This syntax is used to invoke methods on objects and is a distinctive feature of the language. Objective-C also supports features such as protocols, categories, and dynamic typing, which provide flexibility and extensibility to the language.

Objective-C has a rich set of frameworks and libraries that are available for developers to use in their applications. These frameworks include Foundation, UIKit, and Core Data, among others. These frameworks provide a wide range of functionality, such as handling strings, working with user interfaces, and managing data persistence.

Objective-C has been widely used for developing applications for Apple's platforms, including macOS, iOS, watchOS, and tvOS. However, with the introduction of Swift, the popularity of Objective-C has declined. Swift is now the preferred language for developing applications for Apple's platforms, although Objective-C code can still be used and integrated with Swift code.

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