Metatags
Metatags are used by search engines like Google or Yahoo to index your website. They belong to the head part of your document.
<meta name="keywords" content="key, words" />There are a lot more so I suggest you to search for metatags generators.
<meta name="description" content="Your site description" />
<meta name="author" content="name" />
<meta name="copyright" content="name and date" />
Other functions
They can also be used to hide IE6+ annoying image toolbar (if the user hasn't disabled it).
<meta http-equiv="imagetoolbar" content="false" /> Also, it can be used to refresh your page after x seconds.
<meta http-equiv="refresh" content="seconds" /> And finally, it can redirect the user to an other URL but some people find this annoying because if they're redirected and click the button "back", it's always refreshed so they can't go back anymore.
<meta http-equiv="refresh" content="x;URL=new url" />
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Works? Doesn't work? Other tips? Please leave a comment! :)