Understanding Models

Hi

I'm new to cakePHP and OOP.

I'm not understanding
1)what find('all') in the following code means
2) what is the purpose of $this->set('ingredients', $ingredients);
I got this from book.cakephp.org.

<?php
class IngredientsController extends AppController {
function index() {
//grab all ingredients and pass it to the view:
$ingredients = $this->Ingredient->find('all');
$this->set('ingredients', $ingredients);
}
}

?>

any help is much appreciated

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