Markdown is a text-to-HTML conversion tool for web writers. 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).
The goal for MarkdownÂ’s formatting syntax is to be as readable as possible. A Markdown-formatted document should be publishable as-is, as plain text, without looking like it'Â’s been marked up with tags or formatting instructions.
In short, you can create rich HTML documents without knowing any HTML.