Object-oriented programming (OOP) is a programming paradigm that revolves around the concept of objects. Objects are instances of classes and have properties and methods associated with them. One of the key principles of OOP is data abstraction, which allows developers to hide the complexities of an object's internal workings and only expose the necessary details to the outside world. In JavaScript, OOP is implemented using prototypal inheritance, where objects can inherit properties and methods from other objects. Data abstraction in JavaScript involves creating interfaces and encapsulating the inner workings of an object. This allows for better code organization and maintenance. By utilizing OOP and data abstraction in JavaScript, developers can create more modular, reusable, and scalable code. Understanding these concepts is essential for building complex applications and maintaining codebases effectively.