30. What is Doorway page?

Doorway page is also called entrance page, generally what it means is web page that specifically designed to rank better in the search engine.

Because the average web page/site is unfocused and not optimized properly. Common web pages usually is very board targeted and not themed around particular keyword or phrases. Doorway pages are optimized for a single keyword or phrases, so it will achieve a better ranking in the search engines.