Bootstrap Bootstrap is the popular framework for making responsive application development for the web and mobile. Bootstrap includes HTML- and CSS-based design templates for typography, forms, buttons, tables, navigation, modals, image carousels, etc. I will see other libraries that were built based on Bootstrap lately. I think currently everyone must have worked with Bootstrap in your journey as a software developer, and now it’s time to explore the most recent version. Bootstrap 5’s alpha version was released recently, and in this blog, I’ll discuss five of its major features.