Bootstrap is a free and open-source CSS framework directed at responsive, mobile-first front-end web development. It contains HTML, CSS and JavaScript-based design templates for typography, forms, buttons, navigation, and other interface components. It also includes a toolkit of JavaScript plugins, which can be used to add additional functionality to web pages.

Bootstrap is one of the most popular CSS frameworks in use today, and it is used by millions of websites and web applications. It is easy to learn and use, and it provides a wide range of features that can help you to create beautiful and responsive web pages.

Here are some of the benefits of using Bootstrap:

• Responsive design: Bootstrap is built with a mobile-first approach, which means that your web pages will look good on all devices, from smartphones to desktop computers.
• Reusable components: Bootstrap includes a wide range of reusable components, such as buttons, forms, and navigation menus. This can save you a lot of time and effort when you are developing your web pages.
• JavaScript plugins: Bootstrap includes a number of JavaScript plugins that can be used to add additional functionality to your web pages. For example, there are plugins for carousels, tooltips, and popovers.
• Easy to learn and use: Bootstrap is relatively easy to learn and use, even if you are not familiar with CSS frameworks. The documentation is clear and concise, and there are many tutorials and resources available online.

If you are looking for a free and open-source CSS framework that can help you to create beautiful and responsive web pages, then Bootstrap is a great option. It is easy to learn and use, and it includes a wide range of features that can help you to save time and effort.

Here are some of the differences between Bootstrap and CSS:

• Bootstrap is a framework, while CSS is a language. A framework is a set of pre-written code that you can use to build your website. CSS is a language that you can use to style your website.
• Bootstrap includes a lot of features that are not available in CSS. For example, Bootstrap includes a grid system, a carousel, and a tooltip plugin.
• Bootstrap is easier to use than CSS. Bootstrap includes a lot of documentation and tutorials that can help you to learn how to use it.

If you are new to web development, I recommend using Bootstrap. It is a great way to learn the basics of CSS and web development. Once you have a good understanding of Bootstrap, you can then start to learn more about CSS and how to customize Bootstrap to your needs.