Mobile first approach − Bootstrap 3, framework consists of Mobile first styles throughout the entire library instead them of in separate files.
Browser Support − It is supported by all popular browsers.
Easy to get started − With just the knowledge of HTML and CSS anyone can get started with Bootstrap. Also the Bootstrap official site has a good documentation.
Responsive design − Bootstrap's responsive CSS adjusts to Desktops, Tablets and Mobiles. More about the responsive design is in the chapter Bootstrap Responsive Design.
Provides a clean and uniform solution for building an interface for developers.
It contains beautiful and functional built-in components which are easy to customize.
It also provides web based customization.
And best of all it is an open source.
Just to give you a little excitement about Bootstrap, I'm going to give you a small conventional Bootstrap Hello World program, You can try it using Demo link.
Scaffolding − Bootstrap provides a basic structure with Grid System, link styles, and background. This is is covered in detail in the section Bootstrap Basic Structure
CSS − Bootstrap comes with the feature of global CSS settings, fundamental HTML elements styled and enhanced with extensible classes, and an advanced grid system. This is covered in detail in the section Bootstrap with CSS.
Components − Bootstrap contains over a dozen reusable components built to provide iconography, dropdowns, navigation, alerts, pop-overs, and much more. This is covered in detail in the section Layout Components.
Customize − You can customize Bootstrap's components, LESS variables, and jQuery plugins to get your very own version.
This tutorial has been prepared for anyone who has a basic knowledge of HTML and CSS and has an urge to develop websites. After completing this tutorial you will find yourself at a moderate level of expertise in developing web projects using Twitter Bootstrap.
Before you start proceeding with this tutorial, we are assuming that you are already aware about the basics of HTML and CSS. If you are not well aware of these concepts then we will suggest you to go through our short tutorial on HTML Tutorial and CSS Tutorial.