The whole idea of the C++ programming language (Class and Object in C++) is to add object orientation to the language itself. You should also know and never forget that classes are the central function of C++ programming language that supports object orientation.
Classes are used to specify the form of the object. They show data representation and also methods for manipulating it.
Class and Object in C++ Definitions
You should always remember that when you define a class, you don’t actually define any data but only defines the class of the name. It holds information like what it will consist and what it can do.