In February (2009) Google, Microsoft and Yahoo announced a new HTML tag. The new rel="canonical" tag is designed to help reduce duplicate pages by documenting the preferred URL for a group of very similar pages. Duplicate content is a major problem for Search Engines and searchers alike. Having duplicate content on your site can lead to penalties in search rankings. What is a Canonical Page? Definition: Canonical Page is a preferred (authoritative) page among a group of pages that have identical or almost identical content. See Examples below for multiple home pages and Content Management System scenarios.
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