Java is a powerful general-purpose programming language. It is used to develop desktop and mobile applications, big data processing, embedded systems, and so on. Accordingly, Java runs on 3 billion devices worldwide, which makes Java one of the most popular programming languages.
It is used for:
1.Mobile applications (specially Android apps)
2.Desktop applications
3.Web applications
4.Web servers and application servers
5. Games
6.Database connection
And here we will make you understand how to develop mobile apps, web apps, desktop apps, games and much more.

Python is a general-purpose coding language—which means that, unlike HTML, CSS, and JavaScript, it can be used for other types of programming and software development besides web development.
It works on different platforms (Windows, Mac, Linux, Raspberry Pi, etc).
It is used for:
1.web development (server-side),
2.software development,
3. mathematics,
4. system scripting.

C++ is a powerful general-purpose programming language. It can be used to develop operating systems, browsers, games, and so on. It supports different ways of programming like procedural, object-oriented, functional, and so on. It is an object-oriented programming language which gives a clear structure to programs and allows code to be reused, lowering development costs.