Objective-C was the primary programming language for iOS and macOS app development before Swift was introduced. It is still used in legacy applications and certain specialized domains:

• 1.Legacy iOS Apps: Many older iOS apps were written in Objective-C, and while they can be updated to Swift, some remain in this language due to maintenance considerations.
• 2.Cross-Platform Development: Objective-C can be used in cross-platform mobile development frameworks like Xamarin to target both iOS and Android platforms.
• 3.Games and Graphics: Objective-C is used in game development and graphics-intensive applications, especially for leveraging libraries like OpenGL.
• 4.System-Level Programming: In certain cases, Objective-C is used for system-level programming, such as developing kernel extensions or low-level macOS utilities.