Bootstrap is a powerful mobile first front-end framework. This is the most popular HTML, CSS, and JS framework for developing responsive, mobile first projects on the web. It makes front-end web development faster and easier.

History of Bootstrap:

This was by Mark Otto and Jacob Thornton at Twitter & released as an open source product in August 2011 on GitHub.

Why We Need Bootstrap?

Excellent Browser Support:Bootstrap is supported by all popular browsers like Internet Explorer, Firefox, Opera, Safari & Chrome etc.

Mobile first approach:

The framework consists of mobile first styles throughout the entire library instead of in separate files sine since Bootstrap 3.

Easy to started:

Anyone who has the knowledge of HTML and CSS can get started with Bootstrap.
You can get good documentation from its official site.

Responsive design:

Its responsive CSS adjusts to desktops, tablets and mobiles.

Clean and Uniform Solution:

It provides a clean and uniform solution for building an interface for developers & webmasters.

Easy to Customize:

Bootstrap is easy to customize because it consist of beautiful and functional built-in components.

Web Based Customization:

Bootstrap also provides web based customization

Open Source:

The best feature of Bootstrap, it is an open source.

Bootstrap Package

Scaffolding:

It provides a basic structure with Grid System, link styles & background.

CSS:

It comes with global CSS settings, fundamental HTML elements styled enhanced with extensible classes, and an advanced grid system.

Components of Bootstrap:

It consist of dozen reusable components that built to provide iconography, dropdowns, navigation, alerts, popovers, and much more.

JavaScript Plugins:

It consists of dozen custom jQuery plugin which is easy to include. You can easily include them all, or one by one

Customize:

To get your own version you can customize Bootstrap’s components, LESS variables, and jQuery plugin.