[Rails] routes.rb

I'm following the tutorial here:
http://edgeguides.rubyonrails.org/getting_started.html

And, so far, I have the following in the routes.rb file:

get "home/index"
resources :posts
root :to => "home#index"

I know what "root :to => "home#index" is.

But, what is the use of the following, what do they mean?

get "home/index"
resources :posts

Thanks.
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