A frontend framework is a collection of tools and libraries that help developers build the user interface of a website or application. These frameworks provide pre-written code and components, making it easier to create responsive and interactive designs. Popular examples include React, Angular, and Vue.js. Using a frontend framework can speed up the development process by offering reusable components and a structured way to manage the application's state. This allows developers to focus on creating a better user experience without having to write all the code from scratch.