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. They are also known as portal pages, jump pages, gateway pages, entry pages and by other names.
Doorway pages are easy to identify in that they have been designed primarily for search engines, and not for human beings. THIS IS KNOWN AS A BLACK HAT SEO TECHNIQUE
Landing Pages or micro sites on the other hand are designed to lead users in a particular direction using call to action buttons or banners. The home page of your website can be considered a landing page as t is where users will land when they follow a link from a search engine.