A domain template can be created by Plesk Administrator for own needs or for a Plesk Client. When creating a domain template, it is enough to specify the template name. If this domain template is created for Plesk Client, you also need to specify the client id or client login.
In addition, you can specify various domain settings when creating a domain template (all of them are optional):
You can see all these settings on Plesk Control Panel. A domain template can include them all or just some of them. You can specify domain settings when creating a domain template or later (they can be set using the set operation).