Dynamic landing pages are landing pages created on the fly beyond the click for optimizing conversions by ensuring ad continuity and relevance.
There are different kinds of dynamic landing pages.
Some are personalized landing pages that are specifically built by using personal visitor’s informations or visitor’s behavior.
Others are customized for each marketing channel and the layouts and copy variations are trigerred according to traffic sources. For ensuring ad continuity, dynamic landing pages can be used for displaying the specific keyword used for PPC search campaigns or adgroups on AdWords platform.
Dynamic landing page are built with automation marketing tools and are based upon landing page templates.
Strictly speaking, dynamic landing pages are only a particular kind of automated landing pages and don’t favor SEO as they are theorically created when the click occurs