Since the programming language is artificial, various programming languages ​​can be created according to the application. Many programming languages ​​have been created so far, and some of them are programming languages ​​whose main purpose is to be understood by computers (distant from natural languages) and vice versa. There are languages. Roughly classifying program languages ​​according to how similar to natural language, there are three types: machine language, assembly language, and high-level language.