when a user sees a URL in a search engine query that matches title and description they click on the URL Than one that doesn’t make sense to them.
Static URLs are ranked better in search engine results pages, and they are indexed more quickly than dynamic URLs. Static URL doesn’t have a variable string, it looks like this.
http://www.srihithatechnologies.com/seo.html
When we use dynamic Urls there is a risk with search engines as they don’t like them. Dynamic websites like e-commerce stores, forums, and sites utilizing content management systems and blogs or any data base driven website have most risk of losing search engine positioning due to dynamic URLs
Urls generated for the content by a dynamic websites looks like this:
For example, let's look at below 3 URLs:
All these three URLs point three different pages, but if the search engine purges the information after the first offending character, the question mark (?), now all the 3 web pages look the same:
so in the above case as there are no unique pages the duplicate URLs wont be indexed.
Dynamic web pages generally do not have any keywords in the Url. It is very important to have keyword rich URLs. It is good to place highly relevant keywords in the domain names or on the url pages.
Study of top 10 websites in Google, yahoo and msn have reveled that the top 10 websites displayed in Google results has 40-50% of keywords either in the url or on the domain. Yahoo has 60% of keywords in url or in domain. Msn has 85% of keywords in the url or in the domain . | 
