Semantic UI is a modern front-end development framework that helps developers create responsive and visually appealing websites. It uses human-friendly HTML to make the coding process more intuitive, allowing for easier collaboration between designers and developers. The framework includes a variety of pre-designed components, such as buttons, forms, and menus, which can be easily customized to fit the needs of a project. One of the key features of Semantic UI is its use of a theming system, enabling developers to change the look and feel of their applications without extensive coding. This flexibility allows for rapid prototyping and consistent design across different platforms. Overall, Semantic UI streamlines the web development process while enhancing user experience.