C++ is currertly a programming language used globally. What C++ does is make programs/applications to use. It helps in making CGI scripts and console-only DOS programs.
Python is another programming language. It is a very popular programming language because it can be used for anything that requires programming, and is very versatile to use. For example, Python can be used for websites, in gaming, and apps like Instagram.
C is a programming language similar to C++, but C does not support classes and objects. C++ supports classes and objects. C is a computer and general purpose language. It has a lot of functions to operate and is very versatile.
Finally, SQL is another programming language designed for managing data held in a relational database management system or for stream processing in a relational data stream management system.