JavaScript Frameworks are collections of JavaScript code libraries that provide pre-written, standardized code to ease development process of web applications. Coursera's JavaScript Frameworks catalogue helps you understand and utilize popular frameworks such as Angular, React, Vue.js, and Node.js. You'll learn to create interactive UIs, develop single-page applications, handle asynchronous operations, and manage application state. Additionally, you'll acquire skills to create server-side applications, manage databases, and implement RESTful APIs. This knowledge is crucial for web developers, software engineers, or anyone looking to enhance their web application development skills.