Programming is about modeling reality. Object-Oriented Programming (OOP) gives you the tools to create complex, reusable code structures.
1Classes & Instances
A Class is a blueprint. It doesn't contain actual data itself but defines the *structure* that objects will follow. When you use the new keyword, you create an Instance—a living object with its own unique values. The constructor is the factory floor where this initialization happens, using the this keyword to ensure that properties are attached to the specific instance being created rather than the blueprint itself.
2Inheritance & Privacy
OOP is built on pillars. Inheritance allows a child class to 'extend' a parent, gaining all its methods while adding its own specialized logic through super(). Encapsulation is the art of hiding complexity; by using Private Fields (prefixed with #), you can protect critical data from being accidentally modified from the outside. This ensures that your objects maintain their integrity and follow the 'Single Responsibility' principle.
