URL is an acronym for the universal resource locator. It is the address of your website or webpage. If it contains symbols like % and & then it would be difficult for search engine to read it. The search engine friendly URLs play very important role in the we or blog SEO. Here is a search engine friendly url like this:
http://www.creativevim.com/services/  etc.
Try to make the URLs if your website or blog in above format so that it could get good position or rank in search engine.