Swift is the modern and preferred language for iOS and macOS app development, offering enhanced safety, performance, and developer productivity. It is commonly used in various domains:

• 1.Consumer Apps: Swift is used for building a wide range of consumer-facing iOS and macOS applications, including social media, e-commerce, and entertainment apps.
• 2.Enterprise Apps: Swift is employed in enterprise-level iOS and macOS applications for tasks such as productivity, communication, and workflow management.
• 3.Healthcare and Medical: Swift is used in healthcare apps for patient management, telemedicine, and electronic health record (EHR) systems.
• 4.Education: Swift is popular for educational apps and coding education platforms due to its ease of learning and use.
• 5.Gaming: Swift is used in iOS and macOS game development, especially for 2D games and applications that require high performance.
• 6.Augmented Reality (AR) and Virtual Reality (VR): Swift is used in AR and VR app development, leveraging ARKit and other libraries for immersive experiences.
• 7.Utilities and Tools: Swift is employed for creating utility apps, productivity tools, and system utilities for macOS and iOS.
• 8.Machine Learning and AI: Swift is used in machine learning and AI applications on Apple platforms, taking advantage of libraries like Core ML.

The choice between Objective-C and Swift often depends on factors such as project requirements, development team expertise, and the desire to leverage modern language features. While Swift is the language of choice for new iOS and macOS development, Objective-C remains relevant in specific contexts, especially for maintaining existing applications.