Bootstrap

Bootstrap is a leading open-source front-end development framework designed to help developers build fast, responsive, and mobile-first websites and web applications.

It provides a comprehensive collection of pre-built components, a robust grid system, and essential JavaScript plugins, all built with Sass for maximum customizability. Bootstrap allows for deep customization through Sass variables, maps, functions, and mixins, enabling developers to tailor the framework to their specific project needs.

Bootstrap 5 introduces enhanced support for CSS variables, allowing for easier theming and real-time customization of styles, components, and utilities. The framework's Utility API streamlines the creation and modification of utility classes, offering greater control over responsiveness, pseudo-class variants, and custom naming.

Key features include:

• Responsive Grid System: A powerful and flexible grid system for creating layouts that adapt to various screen sizes.
• Pre-built Components: A wide range of UI components like buttons, forms, navigation, modals, and more, ready to be integrated.
• Sass Customization: Extensive Sass variables, mixins, and functions for deep customization of the framework's appearance and behavior.
• CSS Variables: Leverages CSS variables for global theme styles, component styles, and utilities, enabling easier theming and overrides.
• Utility API: A modular system for generating and customizing utility classes.
• JavaScript Plugins without jQuery: Includes powerful JavaScript plugins for interactive elements like modals, tooltips, popovers, and carousels, all without relying on jQuery.
• Bootstrap Icons: An accompanying open-source SVG icon library with over 1,800 glyphs for easy integration into projects.

Bootstrap can be installed via package managers (npm, RubyGems, Composer) or included via CDN, making it accessible for various project setups. Its extensive documentation, examples, and active community support make it a go-to choice for front-end development.