Mark Down Markup Language

wikipedia:

Markdown is a lightweight markup language with plain text formatting syntax designed so that it can be converted to HTML and many other formats using a tool by the same name.[8][9] Markdown is often used to format readme files, for writing messages in online discussion forums, and to create rich text using a plain text editor.

PDF cheat-sheet: https://guides.github.com/pdfs/markdown-cheatsheet-online.pdf

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