Quickly build responsive, professional-looking websites using Bootstrap's pre-built components and grid system.
Bootstrap is one of the oldest and most popular open-source CSS frameworks. Developed at Twitter, its primary goal is to make responsive, mobile-first web development faster and easier. It achieves this by providing a comprehensive collection of pre-styled HTML and CSS components, along with optional JavaScript plugins. The core of Bootstrap is its powerful responsive grid system. It uses a 12-column layout, allowing you to create flexible and complex layouts by simply adding classes to your HTML elements. For example, you can specify that a `div` should take up all 12 columns on a small screen, 6 columns on a medium screen, and 4 columns on a large screen, all with simple, predefined classes like `col-sm-12`, `col-md-6`, and `col-lg-4`. Beyond the grid, Bootstrap offers a vast library of ready-to-use components. This includes navigation bars, buttons, forms, modals, carousels, alerts, and much more. These components are fully styled and often come with built-in functionality, saving you significant development time. While Bootstrap is excellent for rapid prototyping and building standard user interfaces, one of its perceived drawbacks is that many Bootstrap sites can look similar. However, it is highly customizable using Sass variables, allowing you to change colors, spacing, and typography to match your own brand identity.