*🔥 OOP Interview Questions You Should Know (With Quick Answers)* *1️⃣ What is OOP?* *Answer:* A programming paradigm based on "objects" that bundle data and behavior. *2️⃣ What is the difference between a class and an object?* *Answer:* A class is a blueprint; an object is an instance of that blueprint. *3️⃣ What is inheritance?* *Answer:* When one class inherits properties and behavior from another class. *4️⃣ What is polymorphism?* *Answer:* The ability of a method to behave differently based on context (e.g. method overloading/overriding). *5️⃣ What is encapsulation?* *Answer:* Hiding internal details and showing only the necessary parts via public methods. *6️⃣ What is abstraction?* *Answer:* Hiding complexity by exposing only essential features through abstract classes/interfaces. *7️⃣ Difference: Method Overloading vs Overriding?* *Answer:* - Overloading: Same method name, different parameters (compile-time) - Overriding: Redefining inherited method (runtime) *8️⃣ Interface vs Abstract Class?* *Answer:* - Interface: Only abstract methods (by default), supports multiple inheritance - Abstract Class: Can have abstract + concrete methods *9️⃣ What is constructor overloading?* *Answer:* Multiple constructors in a class with different parameter sets. *🔟 What is ‘this’ keyword?* *Answer:* Refers to the current instance of the class. ❤️ *React for more!*