What is an app programming language? An app programming language is a language that is used to create software applications. These languages are used to write the code that tells the computer what to do. There are many different app programming languages available, each with its own strengths and weaknesses. 2. Why are app programming languages important? App programming languages are important because they allow developers to create software applications that can be used on a variety of devices. This includes smartphones, tablets, computers, and even gaming consoles. Without app programming languages, we would not have the amazing apps that we use every day.