Static pages are pages that are always the same.
These sites are not customized for different users and do not provide options for customization.
Every visitor to the web site will see the same information on the page.
Conversely, dynamic pages change with the user.
Dynamic sites can be personalized or customized and are constantly updated.
Updates occur via databases that automatically feed information directly to the site, without human input.
This allows dynamic web sites to always show the latest information.
Dynamic pages work with cookies and server databases.
Below are some common dynamic elements: o    Forms that allow the page to change according to the information entered on the form, including quizzes and check boxes.
o    Flash pages that interact with the user by linking the user to music, pictures, and videos.
o    PHP, Java Script, DHTML, or other dynamic web languages.
Dynamic content can pose challenges for websites in relation to search engines.
For instance, search engine spiders will not crawl and index dynamic URLs, (URLs that contain characters such as ?, cgi, cgi-bin, %).
Spiders also do not index JavaScript or Flash language; however, these obstacles can be easily overcome by webmasters.
For instance, if a site uses a Flash page, the same page should be presented in a non-Flash version for users who do not utilize flash, and all links should also be provided in a non-dynamic format.
These precautions will increase the likelihood that the site will not be overlooked by the spider bots and improve the site's page rank.