HTML means "HyperText Markup Language".

It's text that has markup tags stuck all over so that it can do fancy things, like include pictures or make hypertext links to other web pages.

A blank yet complete HTML document looks like this:

<HTML>
<HEAD>
    <TITLE>The title of the page.</TITLE>
</HEAD>

<BODY>

    Everything you want people to see goes here.

</BODY>
</HTML>