Templates are a system-wide “Content”. They are used to load samples into new Contents. Templates contain widgets and can be edited in the Template Editor which is exactly the same as the Content Editor.
You can find your templates in the Administrator / Templates Menu. Here, you can create, remove and edit your templates. You can also export and import templates.
When you create a Content you can select a template on the Create Content modal.
Administrators can create templates from Content in the Context menu of the Content.