Objective-C is a programming language that has been traditionally used for developing applications on Apple's platforms, including iOS, macOS, watchOS, and tvOS. It has been a primary language for Apple development before the introduction of Swift. Here are some key aspects and use cases of Objective-C:

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  1. Apple Platform Development: Objective-C has been the primary language for Apple platform development for many years. It is used for building native applications on iOS, macOS, watchOS, and tvOS. Objective-C provides access to Apple's frameworks, APIs, and tools, allowing developers to create feature-rich and high-performance applications.
  2. Legacy Codebase: Many existing applications and libraries in the Apple ecosystem are written in Objective-C. If you are working on an older codebase or maintaining legacy projects, understanding Objective-C is essential for maintaining and updating those applications.
  3. C Compatibility: Objective-C is a superset of the C programming language. This means that you can seamlessly mix Objective-C and C code, providing compatibility with existing C libraries and enabling low-level programming when necessary.
  4. Interoperability with Swift: Objective-C and Swift are interoperable, meaning that you can use Objective-C code within Swift projects and vice versa. This allows developers to leverage existing Objective-C code, frameworks, and libraries while gradually migrating to Swift or building new features in Swift.
  5. Dynamic Runtime: Objective-C has a dynamic runtime that allows for powerful runtime manipulation and introspection. It enables features like method swizzling, dynamic method resolution, and runtime introspection, making it useful for advanced use cases, such as creating dynamic frameworks and extending classes at runtime.
  6. Large Community and Resources: Objective-C has a mature and extensive community that has developed numerous resources, libraries, and frameworks over the years. The availability of documentation, tutorials, and open-source projects makes it easier to find solutions and learn from others.

While Swift has become the primary language for Apple platform development, Objective-C remains relevant due to the vast amount of existing Objective-C codebases and libraries. Understanding Objective-C can be beneficial for maintaining legacy applications, integrating with existing code, and leveraging the wealth of resources available in the Objective-C ecosystem.