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Understood.<br />
<br />
I'd offer in return that in your analogy, we could say: <br />
<br />
screwdriver = notepad<br />
powerdrill = LESS/SASS<br />
wood box = CSS<br />
<br />
So, you could use either tool, but you better know how to build a box. &nbsp; :)
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Is it worth learning LESS / SASS? If so, which is better? <br />
Is it a new industry standard yet, or just a fad?
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Is it worth learning LESS / SASS? If so, which is better? 
Is it a new industry standard yet, or just a fad?

LESS / SASS worth learning?

Cascading Style Sheets (CSS) is a language used for describing the look and formatting of a document written in a markup language. Usually used to change web pages and user interfaces written in HTML, it can also be applied to any kind of XML document. CSS is designed primarily to distinguish the content of a document from its presentation.

Web development includes all aspects of presenting content on intranets and the Internet, including delivery development, protocols, languages and standards, server software, browser clients, databases and multimedia generation.

Web Development

Web development can range from developing the simplest static single page of plain text to the most complex web-based internet applications, electronic businesses, and social network services using a wide variety of languages and standards, including the familiar HTML, JavaScript and jQuery, ASP and ASP.NET, PHP, ColdFusion, CSS, PHP, Flex and Flash, but also the implementation of a broad list of standards including XML, WSDL, SSDL, VoiceXML and many more.