A front-end framework is a collection of pre-written, standardized code used to build the user interface (UI) and user experience (UX) components of web applications. These frameworks provide developers with reusable code, UI components, and tools that simplify and speed up the development process for creating responsive, interactive web interfaces.

Popular front-end frameworks include React, Vue.js, Angular, and Svelte. These frameworks typically use JavaScript, HTML, and CSS to build dynamic, high-performance web applications. They often come with built-in features for managing the app’s state, handling user interactions, and efficiently rendering updates to the UI.

Front-end frameworks allow developers to focus on building features and functionality without needing to reinvent the core structure of the application’s interface. They promote consistency, maintainability, and scalability in front-end development by enforcing a modular, component-based approach to UI design.