SEO Best Practices
2 On-Site Optimization – Site Level
2.4 InURL Command
It is interesting to note that keywords in the URL play a part in ranking a page. Embedding keywords in the URL, be it a folder path or a file name is one of the desired methods for improving relevance.
The InURL command is a method of finding relevant results. It is also notable that when doing regular none command searches that major search engines show bold text in URLs containing the keyword phrase searched.