Define the term "Hallway page"?
Hallway page is a web page often created by webmasters who believe that it helps search engines find pages on a website that they might otherwise miss.
As such a hallway page (sometimes called a gateway page) is often no more than a set of links for spiders and robots to follow.
Its basically a page on a website that is no more than a list of links to other pages on the site.
Doorway pages are web pages that are created for the deliberate manipulation of search engine indexes. A doorway page will affect the index of a search engine by inserting results for particular phrases while sending visitors to a different page.