Bootstrap is a widely used open-source front-end framework developed by Twitter. It provides a collection of HTML, CSS, and JavaScript components and styles for building responsive and visually appealing web applications and websites.
Bootstrap offers a grid system, responsive design classes, pre-designed UI components (such as buttons, forms, and navigation bars), and a variety of themes and templates. It simplifies web development by streamlining the creation of consistent and mobile-friendly layouts.
Bootstrap is known for its ease of use and is commonly used by web developers and designers.