Web Design and Development is the practice of creating aesthetically pleasing, responsive, and user-friendly websites and applications. Coursera's web design and development catalogue teaches you about the essential components of creating and maintaining websites. You'll learn everything from the fundamental languages of web development like HTML, CSS, and JavaScript, to more advanced concepts like responsive design, user interface, and user experience design. Additionally, you'll understand the principles of front-end and back-end development, and get to grips with using popular frameworks and libraries. By mastering these skills, you will be able to create websites and web applications that are not only visually appealing, but also functional, user-friendly, and optimized for performance.