I\'ve read a great deal of discussion recently (both on this site and elsewhere) about \"friendly URLs\" but I\'m not sure what exactly makes a URL \"friendly\" and why we r
Thematically linked inner pages that logically work within each other. That is the best way to Silo a URL structure.
The best example, without using client websites would be to look at the BBC website, this has been done in best practice:
www.bbc.com/
www.bbc.com/news
www.bbc.com/news/world
www.bbc.com/news/world/australia
Inner pages have been correctly organised. This is best practice to tell the search engines how to move around the website.