Semantic UI is a popular front-end development framework that provides a set of pre-designed user interface components to help developers create responsive and mobile-friendly web applications with ease. It emphasizes a clear and intuitive naming convention for CSS classes, making it easier to customize and maintain the design of web applications.
A template or theme refers to a pre-designed layout or structure that provides a basic framework for building a specific type of application or website. It typically includes good design, placeholder content and functional features, allowing developers to customize and fill in the details according to their specific needs.