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).
Markdown can be written in a basic text editor (don't use Word) like TextEdit for Mac (save as plain-text) or Notepad on Windows. It's an easy way to write text that easily translates into HTML. The web is written in HTML, so think of it like quick-start web development tool for content editors. When you write in Markdown, you save the document with the file extension .md. More often than not, you'll never need to save a Markdown document, because you'll be using an online tool.
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