SCSS is a preprocessor scripting language that extends the capabilities of CSS by adding features such as variables, nesting, and mixins. It allows developers to write more efficient and maintainable CSS code, and helps to streamline the development process by reducing repetition and increasing reusability.

Gulp.js is an old but popular site building tool that automates various repetitive development tasks in web development, such as compiling Sass, minifying JavaScript, and optimizing images.

Multilingual websites are websites that are available in more than one language. Multilingual websites typically include features such as language selectors, automatic translation, and localized content to make it easier for users to navigate and access the content they need.