What are some of the most popular app programming languages?

Some of the most popular app programming languages include:

Java
Swift
Kotlin
JavaScript
C++
Python
PHP
Ruby
C#
4. What factors should I consider when choosing an app programming language?

There are a number of factors to consider when choosing an app programming language, including:

The type of app you want to create
The platform you want to target
The skills of your development team
The availability of libraries and frameworks
The community support for the language