A template controls the layout of your pages. Not to be confused with Themes Styles (that set the design of your entire site), the template affects the structure of an individual page (or post) or groups of pages (or posts).

The template controls how the page is displayed. Changing a page’s template affects that page only and will not affect your entire site.

One column
Left Column with Navigation
Left Column
Right Column with Navigation
Right Column

Templates that include Navigation will automatically include page navigation based on the parent and children of that current page in the style of the Section Menu block.

Templates that do not include Navigation allow for widgets to be added. Widgets can be found in the Admin Dashboard under Appearance > Widgets.