What programming languages are commonly used for mobile app development?

There are several programming languages commonly used for mobile app development. Some of the most popular ones include:

1. Java: Java is a widely used programming language for Android app development. It offers a robust and flexible platform for creating high-performance mobile applications.

2. Swift: Swift is the primary programming language for iOS app development. It is a powerful and intuitive language developed by Apple, known for its safety, speed, and modern syntax.

3. Kotlin: Kotlin is another programming language for Android app development. It is fully interoperable with Java and offers concise syntax, null safety, and enhanced productivity.

4. Objective-C: Objective-C is the traditional programming language for iOS app development. Although it has been largely replaced by Swift, it is still used in legacy projects and offers compatibility with older iOS versions.

5. C#: C# is a programming language primarily used for developing Windows-based mobile applications. It is also used for cross-platform development with frameworks like Xamarin.

6. JavaScript: JavaScript is a versatile programming language used for developing mobile apps using frameworks like React Native and Ionic. It allows developers to build cross-platform apps using a single codebase.

7. HTML/CSS: HTML and CSS are not programming languages but are essential for mobile app development. They are used for creating the user interface and designing the visual elements of mobile applications.

It is important to note that the choice of programming language depends on the platform (Android, iOS, Windows) and the specific requirements of the mobile app project.