A meta tag (meta element) is a design element which provides information about a web page without being visible to the end user in their browser. Originally much of their content was crucial for search engines in their attempts to correctly categorize and rank pages. For example the meta keywords tag was particularly used by search engines and as a consequence abused by some SEO specialists.
This use has largely subsided as search engines have become better at classifying pages based entirely on the content that the end users are able to see. Other residual uses include things like identifying a site for linking purposes – for example requesting that search engines do not use data on the Open Directory Project to identify a site in their results.
<meta name=”robots” content=”noodp” >