What Exactly Is Object Oriented Programming?


Larry Thompson

Object Oriented Programming (OOP) is a programming paradigm that is widely used in software development. It provides a way to structure code by organizing it into objects, which are instances of classes. In this article, we will explore what exactly OOP is and how it works.

What are Objects?

In OOP, an object is a self-contained entity that consists of both data and behavior. It encapsulates related data and functions into a single unit.

For example, imagine a class called “Car.” An object of this class would represent a specific car instance with its own unique characteristics such as color, model, and speed.

What are Classes?

A class is like a blueprint or template for creating objects. It defines the properties (data) and methods (functions) that objects belonging to the class will have. Going back to our “Car” example, the class would define all the possible attributes and behaviors that any car object could have.

The Four Pillars of OOP

OOP revolves around four main principles: encapsulation, inheritance, polymorphism, and abstraction. Let’s take a closer look at each one:

1. Encapsulation

Encapsulation refers to the bundling of data and methods within an object so that they cannot be accessed or modified directly from outside the object.

Instead, access to these internal components is provided through public interfaces called methods. This helps in hiding the complexity of the underlying implementation and ensures that only valid operations can be performed on an object.

2. Inheritance

Inheritance allows classes to inherit properties and methods from other classes.

It promotes code reuse by creating hierarchies of classes where more specialized classes inherit from more generic ones. For example, a “SportsCar” class can inherit from the “Car” class and add additional features specific to sports cars.

3. Polymorphism

Polymorphism allows objects of different classes to be treated as objects of a common superclass.

It enables the use of a single interface to represent multiple types of objects. This concept is particularly useful in situations where different objects share common behaviors but implement them differently. Polymorphism helps in writing flexible and extensible code.

4. Abstraction

Abstraction focuses on providing simplified representations of complex systems.

It involves hiding unnecessary details and exposing only the essential features of an object or system. Abstraction helps in managing complexity, improves code maintainability, and facilitates code reuse.

Benefits of OOP

OOP offers several advantages over other programming paradigms:

  • Modularity: OOP promotes modular development by breaking down complex problems into smaller, manageable units (objects).
  • Code reusability: Inheritance allows for code reuse, reducing duplication and improving efficiency.
  • Maintainability: OOP’s modular structure makes it easier to update or modify specific parts of a program without affecting other parts.
  • Ease of collaboration: OOP facilitates teamwork as different developers can work on different objects or classes simultaneously.


OOP is a powerful programming paradigm that provides a structured approach to software development. By organizing code into objects and classes, it allows for better modularity, reusability, maintainability, and collaboration. Understanding the four pillars of OOP is essential for writing clean and efficient code.

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