M is for Meta <meta>
The <meta> element always goes in the head element of
a webpage and is used to give overarching or structural information
about a webpage or website. Examples are keywords which help search
engine robots to index the page / site. Also description, copyright,
and author.
The <meta> statement has the form:
<meta name="x" content="y"/>
e.g.
<meta name="author" content="Joe Bloggs"/>
<meta name="keywords" content="boats, planes, automobiles"/>