Views
PrestaShop uses the Smarty template engine to generate its views: http://www.smarty.net/
The views are stored in .tpl files.
A view name is generally the same as the name for the code using it. For instance, 404.php uses 404.tpl.
View overriding
As there is no inheritance, there is no way to override a view.
In order to change a view, you must rewrite the template file, and place it in your theme's folder.