what is jade used for nodejs code example

Example 1: what is html used for

<!-- Answer to: "what is html used for" -->

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  HTML is used to create electronic documents (called "pages")
  that are displayed on the World Wide Web.
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Example 2: What is lua used for

Lua is a powerful and fast programming language that is easy to 
learn and use and to embed into your application. 

Lua is designed to be a lightweight embeddable scripting language.
It is used for all sorts of applications, 
from games to web applications and image processing.

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Used commonly in Roblox, Garry's Mod and Multi Theft Auto