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Bootstrap is a free and open-source collection of tools for creating websites and web applications.  It contains HTML- and CSS-based design templates for typography, forms, buttons, navigation and other interface components, as well as optional JavaScript extensions.  The bootstrap framework aims to ease web development.

Bootstrap is a front end, that is an interface for the user, unlike the server-side code which resides on the "back end" or server. It is also a web application framework, that is a software framework which is designed to support the development of dynamic websites and web applications.  As of May 2015, it was the most-starred project on GitHub, with over 81,000 stars and more than 32,000 forks.