  the noindex value of an html robots meta tag requests that automated internet bots avoid indexing a web page.robots and the meta element, official w3 specificationabout the robots tag reasons why one might want to use this meta tag include advising robots not to index a very large database, webpages that are very transitory, pages that one wishes to keep slightly more private, or the printer and mobile-friendly versions of pages. since the burden of honoring a website's noindex tag lies with the author of the search robot, sometimes these tags are ignored. also the interpretation of the noindex tag is sometimes slightly different from one search engine company to the next. == example == don't index this page possible values for the meta tag content are: "none", "all", "index", "noindex", "nofollow", and "follow". a combination of the values is also possible. see example: == bot-specific directives == there are ways to send the noindex directive only for certain bots, typically by using a different "name" value of the meta tag. for example, to specifically block google's bot,using meta tags to block access to your site, google webmasters tools help specify: or, to block yahoo!'s bot,how to prevent yahoo! search from indexing specific pages, yahoo! search help specify: or, to block msn's bot, specify: == for specific content on the page == to exclude navigation text from searches, the russian search engine yandex has introduced a new tag which only prevents indexing of the content between the tags, not the whole web page. to allow the source code to validate, can alternatively be used: do index this text. don't index this text. don't index this text. other indexing spiders also recognize the tag, including atomz. in 2007, yahoo! introduced the
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