title: Why is a Microsoft.Web/serverfarms resource required for hosting a website?
body: <p>I'm tutoring myself on Azure Resource Manager and Azure Resource Group template files. I'm using the Azure SDK v2.6. 
  I'm intrigued to know why, when I pick a WebSite template, it contains a Microsoft.Web/serverFarms resource. Given that Azure Web Sites is a PaaS offering why do I need to care about the notion of a server farm?</p>
  
  <p>Just interested to know that's all.</p>