Bootstrap
Bootstrap is a widely-used front-end framework for building responsive and mobile-first websites and web applications. Originally developed by Twitter, it offers a collection of tools and resources, including HTML and CSS-based design templates for typography, forms, buttons, navigation, and other interface components. One of its key features is a responsive grid layout system that dynamically adjusts page layout and elements based on the screen size and device, ensuring a consistent user experience across different platforms. Bootstrap simplifies the web development process by providing a cohesive framework with ready-to-use components and customization options. It is favored by developers for its versatility, extensive documentation, and active community support, making it suitable for projects ranging from simple websites to complex enterprise applications.