A Component Library is a collection of reusable user interface (UI) components that developers can use to build applications more efficiently. These components can include buttons, forms, modals, and other elements that are designed to work together seamlessly. By using a component library, teams can maintain consistency in design and functionality across different parts of an application. Component libraries often come with documentation and guidelines to help developers implement the components correctly. Popular examples of component libraries include React components, Bootstrap, and Material-UI. These libraries save time and effort, allowing developers to focus on creating unique features rather than building UI elements from scratch.