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 options in the Add New Page dialog.