Bootstrap is a framework to make your life easy. It is a combination of a css and a js files. You include these files in your web page and start using Boostrap styles (class definitions).
Bootstrap is responsive. When you use Bootstrap in your page, your page becomes responsive. You don't need to do anything special. Both desktop and mobile devices will show your webpage nicely.
Bootstrap covers almost everything. Forms, form elements, tables, overlay windows, carousels, tooltips, transitions, typography, images, icons, grid systems, navigation bars, menus and much more.
Easy to modify and themify. If you are a web developer, we recommend you to start over a ready theme and modify it as you wish. You can download free Bootstrap themes from our website. We don't offer paid themes at that time.