Bootstrap is a popular open-source front-end framework for building responsive, mobile-first websites and applications. It provides a comprehensive set of CSS and JavaScript components, including a flexible grid system, typography, forms, buttons, navbars, modals, and utilities that speed up UI development. The framework emphasizes consistency, cross-browser compatibility, and theming through Sass variables, with easy integration via CDN or npm/yarn. It enables rapid prototyping and scalable, maintainable interfaces across devices.

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Bootstrap

CSS/JS toolkit for responsive UI, grid, components, utilities.

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