C++ is one of the Programming language in computer science.Using that language we can create application like game,calculator and etc .if you want any thing in computer you should interact with any apps. That apps create by programming language.
  we can say operating system one of the application that shuld be created by programming language.
 Using C++ we can create Operating system too. C++ is the basic and powerful object oriented programming language.
C++ is an object oriented language. Means accessing the data through objects.
Clarity is one of the use of C++ and also re-usability of code.