What Is Object-Oriented Programming (OOP)?

Listen to this content

Share this article

Object-oriented programming defines a mode of programming that orients itself around structural objects with related properties. 

Organization plays a critical role in almost every process, from domestic household duties to project management. Programming is no different. 

While the intent of programming is to send instructions to machines, doing this line by line in a sequential fashion is not always the best approach to such a task. 
By conceptualizing code in terms of objects and classes, developers can build software more flexibly and intuitively than otherwise. 

This method of organization has been used at length to write clean, maintainable, and most importantly, reusable code. 

If you aren’t already using object-oriented programming in your software projects, you should be. Continue reading to find out more about the intricacies and benefits of object-oriented programming.

elementor-template id=”7245″] 

What Is Object-Oriented Programming?

Object-oriented programming (OOP) is a programming paradigm that uses the concept of objects to construct well-defined, manipulable pieces of code. 

A programming paradigm describes the way in which a program is organized. Before the emergence of OOP, procedural and structural programming were the principal programming paradigms of the time. 

Procedural programming operates via step-by-step instructions. Structured programming is a bit more complex, utilizing control flows like if/then/else statements and while/for loops. 

However, by far, object-oriented programming exerts the most leverage in a programming environment. 

Object-oriented programming came to fruition in the late 1960s with the early programming language Simula. Years later, Smalltalk refined the object-oriented programming paradigm. 

Now Java, C, and C# are among the most popular object-oriented languages of the modern day. And object-oriented programming is the most popular programming paradigm there is. 

Integral to the core of object-oriented programming is the manipulation of objects. Objects contain data and code which hold properties, procedures, and functions. 

To illustrate the intuitive nature of object-oriented programming, compare an object in programming to an object in real life. 
For example, a car is an object with distinguishable qualities like its color and type. A car can also drive. 

Demonstrating the behavior of a car in a program using procedural or structural programming would no doubt be difficult. 

With object-orienting programming, you can generate a car class and code specificities of the object inside the class. 

Though the details of this undertaking are more drawn out, with object-oriented programming you can assign the defining aspects of the car and control its behavior with a simple function call. 

4 Fundamental Building Blocks of OOP

Four fundamental building blocks encompass how object-oriented programming works: classes, attributes, methods, and objects. 

1. Classes

Classes offer templates to better characterize objects. In effect, classes serve as blueprints for generating objects

Within a class, programmers must define the variables and methods that its corresponding objects can reference. 

Given the car example, a class would denote the properties of the car object, encase the car’s functionality, as well as declare the car as a class in the first place.

A simple line drawing of a car labeled

2. Attributes

Attributes (or variables) refer to the characteristics of the object. Appearance, state, and other qualitative traits are common object attributes. 
Class attributes in combination with object instances differentiate objects from one another. 
The following program demonstrates a class declaration in Python:class Car:

    def init(self, color, type):

self.color = color

self.type = type

Here, ‘self’ represents an instance of the class for future referencing of the object’s attributes and methods. And ‘color’ and ‘type’ represent attributes of the class. 

3. Methods

Programmers also must define methods alongside attributes. Methods encapsulate functions that handle the data and behavior of an object instance. 

In a car, a drive method might be appropriate. You can define such a method right below the car’s attribute definitions. 

Though it is possible via code to render an actual car and simulate a driving application, programming this method is a bit more complex than the lines of code below. 

    def drive(self)

     print(‘I’m driving a‘ + self.color + self.type)

4. Objects

Objects exist alongside classes. They are essentially data fields with distinct structures that the programmer can determine. 

Once you call an object, the program creates an instance. An instance is a specific object generated from a class. 
To call an object, you will need to provide information relevant to the class, such as the particular color and type of the car.

automobile = Car(‘red’, ‘Sedan’)

The code above will formally establish a concrete instance of the unique automobile object. 

Then, you can glimpse how the drive method works in action. 

Altogether, by implementing all the concepts you just learned, you will have the following Python program. 
class Car:

    def init(self, color, type):

self.color = color

self.type = type

    def drive(self)

     print(‘I’m driving a‘ + self.color + self.type)

automobile = Car(‘red’, ‘Sedan’)


As a result, the output on your computer screen will read, “I’m driving a red Sedan.”

A vector illustration of a stylized red car, representing the implementation or instance of a car class in object-oriented programming.

4 Pillars of OOP

In addition to the fundamental building blocks of object-oriented programming, the following technical principles are critical to any object-oriented programming approach. 

1. Encapsulation

Encapsulation is the binding of an object’s state and behavior together. This occurs when attributes and methods are wrapped into a single unit and/or class.

Because of encapsulation, class fields are not directly accessible to the public. In addition, encapsulation offers flexibility and maintainability.
For instance, in the automobile object, the Car class can be hidden from the rest of the program. The benefits are reusability without concern for the specific details on which the object relies and cleaner code overall. 

2. Abstraction

Abstraction shares similar benefits and origins to encapsulation. The principle of abstraction applies when a program only reveals to users data that is relevant to the object. 

Of course, abstraction plays into or onto the idea of encapsulation. Object-oriented programming warrants that programs encapsulate object data within a class so that complex mechanisms can be abstracted. 

Scalability is a major perk of abstraction and OOP in general. Large codebases make for messier changes and maintenance. 

With encapsulation and abstraction working together, programmers can call objects without needing to access or open in-depth class mechanisms. 

In real life, there are plenty of cases that are equivalent to abstraction in programming. 

For one, smartphones have only a few meaningful buttons on the device itself. These buttons permit users to express functionalities without being bogged down by the complexity of the technology. 

Likewise, an object is an abstraction of something behind the scenes that is far more complex than meets the eye

3. Inheritance

When a program has multiple classes with related properties, inheritance can simplify the landscape. In object-oriented programming, child classes can inherit parent classes and akin features. 

To exemplify inheritance, consider how the Car class can share properties with a larger category, like vehicles. 

class Vehicle:

    def init(self, color, type):

self.color = color

self.type = type

class Car(Vehicle): 


    def drive():

print(‘I’m driving a‘ + self.color + self.type)

class Bike(Vehicle):


    def ride():

print(‘I’m riding a‘ + self.color + self.type)

The lines of code here use ‘Vehicle’ as a parent class. ‘Car’ and ‘Bike’ are child classes that inherit the attributes of the parent class with little to no labor involved. 

4. Polymorphism

Polymorphism is the condition of an object being able to take on several forms. That said, polymorphism can take place in various ways. 

Examples of polymorphism include:

  1. Polymorphism with inheritance — Methods in a child class and parent class can carry the same name but have different behaviors. Due to encapsulation, this will not lead to any error in the program. The program will default to the method of the specific object being called. 
  2. Polymorphism with functions and objects — You can define a function outside of a class that relies on class methods and attributes. After instantiating an object, you can make use of the object to deploy the function. 
  3. Polymorphism with class methods — Two or more distinct classes with the same method names rely on polymorphism to resolve discrepancies. Often this looks like a for loop where the control flow can iterate through a tuple of objects from each class. 

What Are the Benefits of Object-Oriented Programming?

Object-oriented programming is so favorable because of its malleability. The ability to regard structures of code as objects in a programming environment empowers programmers to shape programs freely. 


Modularity entails the capacity of OOP to compartmentalize code. If you ever browsed job listings for software developers, a basic requirement on almost every post is that the candidate knows how to write “clean, maintainable code”.
While muddying text on a computer screen is unlikely, the bigger a project is the more intimidating it can be to write several thousand lines of code. Not to mention, you will have to stare at the monstrosity every time you attempt to make a change. 

Object-oriented programming encapsulates an enormous amount of information within a single class. Arguably, OOP allows for building programs quite literally inside of programs, which eases the development process as a whole. 


You can use and reuse objects again and again throughout your program. What’s more, you can even import objects from outside the program. 

Zeroing in on Python again, one of its premier modules is turtle. Turtle is a Python library that extends drawing tools to Python programmers. 

But more than a drawing tool, turtle is a predefined object that demonstrates the grandeur potential of OOP. The Turtle object is essentially a marker instrument. 

Using the turtle module, you can name your Turtle object, color it, and guide it. Repeated movements, courtesy of object methods, enables users to draw intricate shapes. 

The relevance of all this is the mere convenience of being able to call an instance of a class and have full utilization of its capabilities. No prior context of the object is necessary to use its prowess. 

import turtle              

wn = turtle.Screen()        

trio = turtle.Turtle()      




After importing the turtle package, the user creates a graphics window and calls the object, naming it ‘trio’. The remaining handful of Python code traces half a rectangle.


Reusability is an extension of pluggability, another useful perk of object-oriented programming. You already know you can plug in objects whenever and wherever you want in your program. 

But pluggability lends extra advantages that you may not be aware of. In particular, if a certain object presents problems in the debugging process, you can simply remove it. Add a different object as you wish. 

Objects in the real world show similarities. When something breaks, you need only replace a few screws, in turn for upturning and fixing the entire machine. 


Class declarations can be entirely hidden from public view. Though object-oriented programming does not mean to be a secretive endeavor, information-hiding can be superbly advantageous. 

Apart from the act of writing code itself, visualizing and contextualizing a hefty mass of code can be mentally exhausting. By hiding the inner workings of an object in the interior of a class declaration, you only have to interact with an object’s methods.

What Are the Concerns Related to Object-Oriented Programming?

To be frank, there are not many downsides to OOP. But running massive amounts of code sheathed under a singular entity can be a strenuous task for any machine

Larger programs are also a natural consequence of employing object-oriented programming principles. Given the chance to condense code, the outcome tends to be more code on the whole. 

In other words, the most major drawback of object-oriented programming is that it will be difficult to compile. 

At the same time, scalability is paramount for any business in the software development industry. And this can rarely be accomplished without object-oriented programming. 

5 Best Object-Oriented Programming Languages

Object-oriented programming languages provide the syntax and back-end measures for developers to exercise OOP as they so desire. Here are the most popular and high-performing object-oriented programming languages.

A graphic timeline showing icons for programming languages and technologies like Python, Java, C, C#, and Ruby, with a server or database icon in the middle, illustrating the evolution or integration of different programming languages and technologies in software development.

1. Python

Python is an interpreted, high-level, general-purpose programming language. Developers choose Python for a variety of use cases. 

Python applications range from game development to data science and machine learning. 

2. Java

As a class-based programming language, Java is designed to have few dependencies; thus, Java developers can look forward to uninterrupted reusability

Java is known for being the official programming language for Android development

3. Ruby

Ruby stands out among other object-oriented programming languages as its goal is to perceive nearly everything written in the language as an object. 

Yukihiro “Matz” Matsumoto, the designer of Ruby, created the language when he felt that alternative OOP languages like Python were not truly object-oriented. 

Ruby on Rails is a beloved web framework stemming from the Ruby language. 

Elevate Your Team with Trio AI Talent

Empower Your Projects with Trio’s Elite Tech Teams

4. C++

C++, or ‘C with Classes’ is an object-oriented extension of C. C is a classic programming language that still ranks high in the TIOBE Index today.

Yet its extension C++ performs exceptionally well when working with embedded systems like smartwatches and medical machines. 

5. C#

C# is a language of the .NET framework, a product of Microsoft that guides developers in building applications. 

Like C++, C# is also a middleware language that can work closely with hardware. C# is primarily used for game development in Unity


Object-oriented programming is a valuable approach to software development that you should not take for granted. It’s likely that the developers on your team are already well-familiar with OOP principles and use them every day to optimize your processes. 

Becoming more familiar with the methodologies that are upholding your business will ensure that you better understand what your organization is truly capable of. 

To fully grasp how OOP can be beneficial to the software development process, you must take note of programming concepts like encapsulation, abstraction, polymorphism, and inheritance. 

These OOP fundamentals garner many advantages for the common program, flexibility, and coherence being the overarching gains. 

Hiring qualified software developers can help you get the best out of object-oriented programming and other important software principles. Work with Trio today!

Unlock the Secrets to Hiring Top Talent

Don’t Miss This Opportunity! Streamline your hiring process with Trio’s comprehensive guide.

Share this article
With over 10 years of experience in software outsourcing, Alex has assisted in building high-performance teams before co-founding Trio with his partner Daniel. Today he enjoys helping people hire the best software developers from Latin America and writing great content on how to do that!
A collage featuring a man using binoculars, a map pin with a man's portrait in the center, and the Brazilian flag fluttering in the wind against a blue background with coding script overlaid.

Brazil's Best in US Tech: Elevate Projects with Elite Developers

Harness the Vibrant Talent of Brazilian Developers: Elevate Your Projects with Trio’s Elite Tech Teams, Pioneering Innovation and Trusted for Global Success

Get Expert Insights on Outsourcing and Hiring Software Developers

Download Our Free Ebook Now!