The most widely used mobile app is Java, which is also Android's oldest and official native language. The Android Studio development environment is compatible with it.
Google debuted Kotlin as a second "official" language in 2017. In many aspects, it is comparable to Java but simpler to use.
The mobile development tools Android Studio and iOS support both C# and C++. You can use them with the Android NDK to use C/C++ to implement native code.
Programming languages for PWAs, or Progressive Web Apps, include Python. It is a well-liked, strong, adaptable, and extensively used language.