This article describes a new feature, Site Closure and Deletion, in SharePoint 2013.
A site policy is used to define when the site will be closed and when the site will be deleted. Please refer to http://office.microsoft.com/en-001/sharepoint-help/site-closure-policies-HA102925509.aspx to learn more about Site Policies in SharePoint 2013. If you define site policies in a content-type hub, then you can publish policies and share them across site collections. Please refer to http://www.c-sharpcorner.com/UploadFile/anavijai/site-collections-in-sharepoint-across-site-collections-in-sh/ to learn more about publishing site policies across site collections.
Thus in this article, you have seen how to create a site policy and apply that to a particular site.