Bootstrap is a popular open-source front-end framework designed for developing responsive, mobile-first websites and web applications. It provides a collection of HTML, CSS, and JavaScript components that simplify the process of creating modern and responsive designs, making it easier for developers of all skill levels to build good-looking and functional web applications quickly. What is Bootstrap Key Features of Bootstrap Responsive Design: Bootstrap is built on a mobile-first approach ... What is Bootstrap ? Why is it important? Learn why anyone interested in front-end engineering should learn Bootstrap to quickly build mobile-ready websites. Bootstrap 5 is the newest version of Bootstrap , which is the most popular HTML, CSS, and JavaScript framework for creating responsive, mobile-first websites. Bootstrap 5 is completely free to download and use! What is Bootstrap ? Bootstrap is a free, open source front-end development framework for the creation of websites and web apps. Designed to enable responsive development of mobile-first websites, Bootstrap provides a collection of syntax for template designs. As a framework, Bootstrap includes the basics for responsive web development, so developers only need to insert the code into a pre-defined grid system. The Bootstrap framework is built on Hypertext Markup Language (HTML), cascading ...