SEO Tip #8 - Dynamic vs. Static Pages

There are many kinds of content pages types. They are all can be divided to two; Dynamic web pages and static web pages.
Dynamic pages can be coded in ASP, PHP etc and static pages are normally HTML or Xhtml which is the most easily crawled by the major web search engines.
Dynamic web pages became very popular online since the updating and writing them is much less time consuming then the static ones. But the main problem is that dynamic pages create Dynamic URL's which are automated by the system, database or script. This URL's normally include signs like /?* etc which can be problematic to the SE crawlers. Dynamic pages normally been used in forums, blogs, online shopping sites and other sites that need to update content frequently

Static domain will reflect the location of the page in the server. For example if you open a folder called articles, and inside you put the article 'sample.html' you will get the URL: www.yourdomain.com/articles/sample.html VS. Dynamic URL which will look like www.yourdomain.com/articles/sample.php?threadid=12345&sort=date

Static pages are much more SE friendly and normally ranked better in SERP, because its easier for the crawlers to crawl them. Most of the time crawlers will ignore everything that is written in the address bar after a certain number of variables e.g (> & =)

Other forms of files cannot be read by crawlers: flash files (.swf) Java applets, Executable Files (.exe) windows media player files and images (.gif, .jpg. png)

Read more here
Dynamic Urls vs Static Urls