What is noindex, nofollow?

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Many SEO professionals use “noindex” tags to prevent a search engine robot from indexing a particular page on a site. We use “nofollow” tags to prevent the passing of page rank through a particular link to the linked-to page (aka “bot herding”, “page rank sculpting”, etc.).

More about noindex tips: http://www.searchenginejournal.com/googl...es/119203/