This blog introduces the concept of Object-Oriented Programming (OOP), which is the dominant paradigm in software development for building scalable products. It covers the core concepts of OOP, such as classes, objects, methods, interfaces, and constructors, as well as the four fundamental principles of OOP, which are Encapsulation, Inheritance, Polymorphism, and Abstraction. The blog provides examples and code snippets to explain each concept and principle.