Bootstrap is a popular front-end framework for building responsive and mobile-first websites. It provides pre-designed CSS, JavaScript components, and utility classes to quickly create modern and consistent user interfaces.

It Includes pre-built responsive grid systems for mobile-first design.

Offers a wide range of UI components like buttons, modals, and navbars.

Provides built-in support for responsive typography, spacing, and utilities.

Extensively customizable via Sass variables and Bootstrap's configuration.

To start with Bootstrap, you need to install it on your project or use the CDN link.

Bootstrap CSS and JavaScript files are included via CDNs with integrity attributes for security.

The container class ensures the content is responsive and aligned.

The text-center class centers the text within the div.

The text-success class adds a green color to the heading, using Bootstrap's built-in color utilities.