Object-Oriented Programming (OOP) and Data-Driven Design (DDD) are two fundamental concepts in software development. OOP focuses on modeling real-world entities as objects, which have attributes and behaviors. It allows for encapsulation, inheritance, and polymorphism, making code more modular and easier to maintain. On the other hand, DDD emphasizes designing software based on the data and the relationships between them. It aims to align the codebase with the domain model, making the codebase easier to understand and maintain. Both OOP and DDD play crucial roles in creating scalable, maintainable, and efficient software. Understanding these concepts is essential for any software developer looking to create high-quality applications.