<p><ahref="https://daringfireball.net/projects/markdown/">Markdown</a> is a markup language.
Markup languages are used to structure the linguistic syntax of a chosen system in a more user-friendly way. These languages are supposed to be easier to use than the actual code, as they are to be read by humans. What is written can easily be converted into the syntax of other languages.
Markdown has been originally developed to simplify writing <ahref="#htmlcssjs">HTML</a>, but has ever since changed its role and now it provides conversions into different formats.