Markdown Guide
Markdown is a lightweight markup language with plain-text-formatting syntax, created in 2004 by John Gruber and Aaron Swartz. Markdown is often used for formatting readme files, for writing messages in online discussion forums, and to create rich text using a plain text editor from Markdown.
This article is a guide to get you started with writing markdown files.
Markdown allows you to write using an easy-to-read, easy-to-write plain text format, then convert it to structurally valid XHTML (or HTML).