Often, two or more copies of the exact same content appear on your website under different URLs. For example, the following URLs can all refer to a single homepage:http://www.example.com/http://www.example.com/default.asphttp://example.com/http://example.com/default.asphttp://Example.com/Default.aspTo search engines, these appear as five separate pages. Because the content is identical on each page, this can cause the search engines to devalue the content and its potential rankings. The canonical tag solves this problem by telling search robots which page is the singular, authoritative version that should count in web results.
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