Bootstrap is a free, open-source front-end framework for building responsive websites and web apps. It bundles a grid system, pre-styled components, and JavaScript plugins so you can lay out pages quickly without writing CSS from scratch.
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Originally created at Twitter, it's one of the most widely used frameworks on the web, valued for its consistency, mobile-first grid, and large ecosystem of themes and plugins.

Why does Bootstrap matter?

Bootstrap speeds up development by giving teams a shared set of ready-made components, like buttons, navbars, modals, and forms, that already look polished and work across devices. That means less time reinventing basic UI patterns and more consistency across a project.

Designers and developers often reach for it when prototyping quickly or building a site where custom, from-scratch styling isn't the priority. It's also a common baseline to customize with your own theme or Sass variables for a more branded look.

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