SCSS is one of the two syntaxes available for Sass - a CSS preprocessing language. This article talks about the different Sass syntax and the difference.
Syntactically Awesome Stylesheets (Sass) is a CSS pre-processor, have .scss and .sass formats, and is similar to CSS3. Compass is a CSS authoring framework and is open source. For both compass and Sass we need to install ruby which is an object-oriented, reflective, dynamic, general-purpose programming language.
SASS is called Syntactically Awesome Style-sheets. SASS is said as an extension or scripting language that is interpreted to the CSS. SASS was developed by Hampton Catlin and Nathan Weizenbaum with the aim to maintain complicated style-sheets. As said before with SASS we will be amazing features to build better style-sheets for making life easy.