Doorway page - SEO Glossary
A doorway page is specificaly designed for the search engines to rank well. One would be designed for Google and one for Yahoo! The pages would be differently optimised to rank well on both. When a normal user visits the page it will either detect their IP address and redirect them to the correct page (cloaking) or it will have a large link for them click through to the full site. Either way it is not great practice to use this type of tactic.