Totally white magic here. Those are helpers Rails uses in order to generate paths and URLs automatically: http://guides.rubyonrails.org/routing.html#path-and-url-helpers.
For example, if you generated scaffold Person, you are going to have automatically the following helpers available:
people_path() # /people, because rails uses 'person'.pluralize
new_person_path() # /person/new
edit_person_path(@person) # /person/:id/edit
person_path(@person) # /person/:id
etc.