Bootstrap is a free and open-source CSS framework directed at responsive, mobile-first front-end web development. It contains CSS- and JavaScript-based design templates for typography, forms, buttons, navigation, and other interface components.

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To use Bootstrap, you can either include the Bootstrap CDN in your project or download the Bootstrap files and link them locally. Then, you can apply Bootstrap classes to your HTML elements to style your webpage.

• Responsive grid system - Adapts to different screen sizes
• Prebuilt components - Includes buttons, forms, and navigation
• Powerful plugins - Built on jQuery
• Sass variables - Easier customization