What is the difference between bootstrap & bootstrap-theme.css?

Bootstrap is a CSS framework used for front-end development. Bootstrap does not allow the user to create codes from scratch. Instead, the user makes use of predefined terms and logic written in HTML, CSS, and JavaScript to build user interface components. Bootstrap is a fast, free, and open-source framework used to develop a responsive and mobile-based project on the web.

Bootstrap-theme is a package that contains HTML, CSS, and JavaScript. Bootstrap-theme provides support for styling, page layouts, and UI components for use in a web project. Bootstrap-theme includes navbars, buttons, panels, a dropdown menu, and a progress bar.

Key difference between Bootstrap and Bootstrap-theme

Bootstrap.css is used to design a website with context and pre-existing designs. The website is styled by importing the CSS link in the bootstrap website, whereas Bootstrap-theme.css is used to add user interface components such as navbar, buttons, and a progress bar to a website. The user interface component can be added by calling class attributes in the code. Bootstrap-theme.css is also used to format text with different styles.