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Which url is more search engine friendly ( using _ (under score) or - (dash)?

i am trying to implement routing on my website. and just want to know which typr of url is more indexed by goolgle?

examples :

  1. http://www.example.com/contact_us
  2. http://www.example.com/contact-us

also i have one more senario

  1. http://www.example.com/products-services
  2. http://www.example.com/products-and-services

if i use "and" in url will it make any difference in ranking?

Solution

  • Dashes are much better.

    Matt Cutts from Google confirmed that in his blog - http://www.mattcutts.com/blog/dashes-vs-underscores/

    Regarding "and": check Google Keyword tool. If people search with "and" then use and. If not it's better to skip "and" because URL will be shorter and it's good for SEO.