Official Google Webmaster Central Blog: Using the robots meta tag - 0 views
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Vernon Fowler on 21 May 13Valid meta robots content values Googlebot interprets the following robots meta tag values: NOINDEX - prevents the page from being included in the index. NOFOLLOW - prevents Googlebot from following any links on the page. (Note that this is different from the link-level NOFOLLOW attribute, which prevents Googlebot from following an individual link.) NOARCHIVE - prevents a cached copy of this page from being available in the search results. NOSNIPPET - prevents a description from appearing below the page in the search results, as well as prevents caching of the page. NOODP - blocks the Open Directory Project description of the page from being used in the description that appears below the page in the search results. NONE - equivalent to "NOINDEX, NOFOLLOW".