11ty is a static site generator that allows developers to build fast, modern websites using HTML, Markdown, and other templating languages, without the need for a complex build system.

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.