What's the difference between CSS3,SASS,SCSS?

Question

Differences between the CSS variations

Answer 1

SASS (Syntactically Awesome Style Sheets).
SASS is a superset (extension) of CSS3 and provides extra functionality such as nesting, variables, mixins etc…
SASS can generate CSS files on the fly as you edit them.
Sass is processed server-side using Ruby.
SASS uses line breaks and indentation to determine rule separations much like HAML.
SCSS (Sassy Style Sheets).
SCSS is functionally the same as SASS except it uses curly braces to separate rules.

Resource: https://www.sitepoint.com/css3-compass-sass/