Defined names do not include "robots" (the name is still under discussion), that said most search engines will follow the directive.
The robot directive states whether a page should be followed or stored by a search engine. The robot tag is restrictive. If you do not intend to restrict the search engine then do not include it.
index: search engine robots should include this page
follow: advises robots to follow links fromthe current page to other pages.
noindex: current page cannot be indexed but its links can be followed
nofollow: the current page can be indexed, but its links cannot be followed
none: page cannot be index and links cannot be followed
NoODP Meta Tag
This attribute is relatively new. It allows you to tell MSN and Google that you do not want them to consider using the Open Directory Project (ODP) description for your site in their search results.
The main reason for this is that many site descriptions in ODP have become out of date
Specify Robot
You can target a particular robot:
<meta name="robots" content="noopd">
<meta name="msnbot" content="noopd">
<meta name="googlebot" content="noopd">