Doorway pages are web pages that are created for spamdexing, this is, for spamming the index of a search engine by inserting results for particular phrases with the purpose of sending you to a different page. They are also known as landing pages, bridge pages, portal pages, zebra pages , jump pages, gateway pages, entry pages and by other names. Doorway pages that redirect visitors without their knowledge use some form of cloaking.
If you click through to a typical doorway page from a search engine result page, in most cases you will be redirected with a fast Meta refresh command to another page. Other forms of redirection include use of Javascript and server side redirection, either through the .htaccess file or from the server configuration file. Some doorway pages may be dynamic pages generated by scripting languages such as Perl and PHP.
Doorway pages are often easy to identify in that they have been designed primarily for search engines, not for human beings. Sometimes a doorway page is copied from another high ranking page, but this is likely to cause the search engine to detect the page as a duplicate and exclude it from the search engine listings.
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