Doorway pages are Web pages planned and built specially to attract search engine visitors to your website. They are detached pages intended only to operate as doorways to your site. Doorway pages are a very bad proposal for some reasons, though many SEO firms use them habitually. It is a form of black hat SEO, which is prohibited and not good enough by search engines like Google.

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I don't know much about the doorway pages. But I know that this is a black hat seo tactic which are never prefer by the Google Webmasters.