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C++ supports object-oriented programming, but OO is not intrinsic to the language. In fact, the main function isn't a member of an object. In smalltalk or Java, you can't tie your shoes (or write Hello, world) without at least one class.
OOP is a technique to develop logical modules, such as classes that contain properties, methods, fields, and events. An object is created in the program to represent a class. Therefore, an object encapsulates all the features, such as data and behavior that are associated to a class. OOP allows developers to develop modular programs and assemble them as software.