SCSS stands for Sassy CSS (Sass CSS), which is a scripting language that is interpreted into Cascading Style Sheets (CSS). It's a CSS preprocessor that extends the CSS language, adding features such as variables, nesting, mixins, and functions, which make it easier and more efficient to style web content. With SCSS, developers can write styles more efficiently and manage large stylesheets more effectively. The syntax of SCSS is similar to CSS, but with the added features, it's easier to read, write, and maintain. SCSS code is then compiled into CSS code, which can be interpreted by web browsers.