Managing Apps for SharePoint Server 2013 – Configuring a SharePoint Farm to Support Apps 

So everything that you deploy in SharePoint 2013 should be an app. Why do I then see so often that the basic infrastructure to install an app hasn’t been enabled? … read the managing-apps-for-sharepoint-server-2013-configuring-a-sharepoint-farm-to-support-apps-%ef%81%b5 post