Bootstrap
Open-source CSS framework developed by Twitter for rapidly building responsive and modern web interfaces with pre-designed components.
Updated on January 22, 2026
Bootstrap is the world's most popular front-end framework, offering a comprehensive library of ready-to-use HTML, CSS, and JavaScript components. Created in 2011 by Mark Otto and Jacob Thornton at Twitter, it enables developers to quickly build responsive and visually consistent websites. With its flexible grid system and pre-designed components, Bootstrap significantly accelerates the development process while ensuring cross-browser compatibility.
Fundamentals
- Flexible 12-column grid system with flexbox for responsive layouts
- Extensive library of UI components (buttons, forms, modals, navigation, cards)
- Pre-defined CSS utilities for spacing, typography, colors, and positioning
- JavaScript for interactive components (dropdowns, carousels, tooltips, modals)
- Mobile-first architecture with predefined responsive breakpoints
Advantages
- Rapid development through pre-styled components reducing custom CSS code
- Visual consistency guaranteed across the entire project with a unified design system
- Cross-browser compatibility tested and maintained by a large community
- Comprehensive documentation with concrete examples and reusable code snippets
- Advanced customization via Sass variables and custom compilation