Web Developer Cum SEO Analyst Question:

Doorway Pages, also known as gateway pages, portal pages or entry pages, refer to web pages or websites that are developed for higher ranking when specific search queries are entered.

Such pages give way to multiple web pages on the SERP which lead users to the same web destination. These can also funnel the users to intermediate pages that does not hold as much importance as the final webpage. Two common forms of doorway pages are cloaking and redirecting pages.