Why doorway pages used?
 

Doorway pages are web pages that are created for spamdexing. This is for spamming the index of a search engine by inserting results for particular phrases with the purpose of sending visitors to a different page.

It's a black hat technique. Don't do this.

Doorway pages are web pages that are created for spamdexing. This is for spamming the index of a search engine by inserting results for particular phrases with the purpose of sending visitors to a different page.

Doorway pages are web pages that are created for spamdexing. This is for spamming the index of a search engine by inserting results for particular phrases with the purpose of sending visitors to a different page.

Doorways are sites or pages created to rank highly for specific search queries. They are bad for users because they can lead to multiple similar pages in user search results, where each result ends up taking the user to essentially the same destination. They can also lead users to intermediate pages that are not as useful as the final destination.

Here are some examples of doorways:

Having multiple domain names or pages targeted at specific regions or cities that funnel users to one page
Pages generated to funnel visitors into the actual usable or relevant portion of your site(s)
Substantially similar pages that are closer to search results than a clearly defined, browseable hierarchy

You moment get positioning yet google punished for that this method is under black hat SEO.

Oh, you shouldn't do it.

Doorway pages are easy to identify in that they have been designed primarily for search engines, not for human beings. This page explains how these pages are delivered technically, and some of the problems they pose.

It's a black hat technique to index the webpage.

Doorway pages is use to identify that they are used to designed primarily for search results, This will explains that these pages will be delivered and they detect the problems.

Webmasters are sometimes told to submit “bridge” pages or “doorway” pages to search engines to improve their traffic. Doorway pages are created to do well for particular phrases.

Doorway pages are web pages that are created for spamdexing. This is for spamming the index of a search engine by inserting results for particular phrases with the purpose of sending visitors to a different page.

Doorway pages are simple HTML pages that are customised to a few particular keywords or phrases, and they are programmed to be visible only by specific search engines and their spiders. The purpose of these doorway pages is to trick the search engines into giving these sites higher rankings; this sounds okay until you realise that they are not static destinations.

Doorway pages are site pages that are made for spamdexing. This is for spamming the record of a web search tool by embeddings results for specific expressions with the motivation behind sending guests to an alternate page.

yes It's a black hat technique. Don't do this.