Templates are initially created as Default templates. If you want to change the template type to either a New Page or Content template, you must edit the template properties. The selection you make controls how templates are made available to your authors.
Default templates are referenced by other templates for inclusion, but aren't surfaced in the Templates or New dialogs. Default templates are mainly used for developer or branding efforts.
New Page templates
New Page templates appear as page template options in the New dialog. The use of New Page templates ensures standardization of your content and consistency in look and feel across your site. New Page templates are most often used for FAQs, best practices and any other pages that may require specific layouts or significant formatting.