[Rails] What does "require tree" do in Rails 3.1?

In Rails 3.1....

This is my application.css:

/*

 *= require_self

 *= require_tree . 

*/

This is my application.js:

//= require jquery

//= require jquery_ujs

//= require jquery-ui

//= require_tree .

What does the "require_tree ." do?

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