The programming paradigm that focuses on the use of objects containing data and behavior is called Object-Oriented Programming (OOP). OOP is centered on the concept of encapsulating data and functions that operate on that data within objects. This paradigm enhances code organization, reusability, and maintainability by allowing developers to model real-world entities and relationships. Key principles of OOP include inheritance, polymorphism, encapsulation, and abstraction, which contribute to creating robust and scalable software solutions.