Gateway Pages Black Hat SEO Technique:

Doorway or Gateway pages are pages designed for search engines and not for the end user. They are basically fake pages that are stuffed with content and highly optimised for 1 or 2 keywords that link to a target or landing page. The end user never sees these pages because they are automatically redirected to the target page.

Off-the-shelf SEO software often encourages the use of gateway pages as do SEO firms that don’t know what they’re talking about. Search engine spiders are being enhanced continually to detect these pages and will get ignored or worse still, flag your site up as being spam and ban you all together.