Bootstrap is a free and open-source CSS framework aimed at responsive, mobile-first front-end web development. It includes HTML, CSS, and (optionally) JavaScript-based design templates for typography, forms, buttons, navigation, and other interface components.  All HTML elements in Bootstrap have basic style definitions. As a result, prose, tables, and form elements appear consistently across web browsers. Furthermore, developers can use CSS classes defined in Bootstrap to further customize the appearance of their content.  

The layout components of Bootstrap are the most visible because they affect the entire web page. Because every other element on the page is placed in it, the basic layout component is called a “Container.” Developers have the option of using a fixed-width container or a fluid-width container.

The latest version of Bootstrap is 5.2.2 but it’s backward compatible.  As with previous versions, version 3 and version 4 are still supported for critical bug fixes but no longer add more functionalities.  Bootstrap version 3 is the most stable version.  Bootstrap version 4 is a newer version with a faster stylesheet and more responsiveness.  And Bootstrap version 5 is the newest version but JQuery is replaced with vanilla JavaScript.

Technically, Bootstrap has 3 major versions running, and developers and designers can use the latest version 5 or the old version 3 (still supported critical bug fixes) or stick to the middle ground version 4.  So the questions must be asked:  Which version to choose and why?

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