SASS stands for Synactically Awesome Stylesheets
LESS which stands for Leaner CSS
Both SASS and LESS are used to write CSS.
What is SASS?
Sass is a scripting language that is interpreted into Cascading Style Sheets (CSS).
Sass makes CSS fun again. Sass is an extension of CSS3, adding nested rules, variables, mixins, selector inheritance, and more. It’s translated to well-formatted, standard CSS using the command line tool or a web-framework plugin.
So Sass is a great way of writing a more terse and functional way of writing CSS. Of course the Web Workbench does away with the need to use a command line tool or web-framework plugin as you write Sass, we'll generate the CSS when you save!
Read More at : http://sass-lang.com
What is LESS?
The LESS website describes LESS as:
The dynamic stylesheet language
LESS extends CSS with dynamic behavior such as variables, mixins, operations and functions.
LESS runs on both the client-side (IE 6+, Webkit, Firefox) and server-side, with Node.js.
In simple terms, LESS allows you to write CSS in a smarter way by combining functions, mixins, operations and more.
This means you write more concise style information and can reuse things like colors and styles more easily.
The Pro edition of the Web Workbench supports generating CSS files automatically rather than needing to do JavaScript parsing.
Thankfully the Web Workbench includes all the requirements and is a nice simple one install way of working with LESS.
Read More at : http://lesscss.org/
Video Tutorial Link about SASS and LESS
