It was a so called myth that search engine robots can't read Dynamic urls, but as it appears Dynamic urls are somewhat better than Static urls. In between the contrast of Static Vs Dynamic URLs, dynamic urls are mostly preferred by the Google's search quality team.As for examples, a static url will look like this: www.example.com/article/bin/answer.foo/en/3/98971298178906/URL, whereas, a dynamic url will look like this: http://example.com/my-name-is.html or http://example.com/my-name-is/. So, you can see the difference between them that a dynamic url allocates a content with words, and a static url allocates a content with number (in simple understanding). As web-masters say, these static urls mostly create problems for the search engine robots.