Quick Tip: Use hyphens in your URL structure
All pages on your website should have a clean URL structures to make it easier for people to read. For example:
wrong:
http://www.example.com/index.asp?_prod138272=isp9872=498260
correct:
http://www.example.com/products/hats
Google recommends that you separate two or more words with a punctuation instead of squishing them together and use hyphens (-) instead of underscores (_) between them. For example do:
http://www.example.com/products/red-hat
instead of
http://www.example.com/products/redhat
or instead of
http://www.example.com/products/red_hat