Ruby on Rails

In the "Ruby on Rails tutorial" website:
http://railstutorial.org/chapters/filling-in-the-layout#sec:rails_routes,
section 5.2.2: Rails routes, it was mentioned that:

match '/about', :to => 'pages#about'

Creates the following "named routes" for use in the controllers and
views:

about_path => '/about'
about_url => 'http://localhost:3000/about'

After that, in section 5.2.3: Named routes:

"#" in: <%= link_to "About", '#' %>

Was replaced by: <%= link_to "About", about_path %>

From this thing, why did I use "about_path" here and NOT "about_url"?
Are they differeny then?

So, does "about_path" denote the controller's "action"?

Thanks.

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