Windows Server Update Service [WSUS] is a server role that serves as a repository for Microsoft product updates on your network. Instead of every computer on your network downloading updates directly from Microsoft you can deploy a WSUS server so the updates are downloaded once and distributed to your environment from the WSUS server.
In this post I will be deploying WSUS Server 2012 R2 in a domain environment, using the Windows Internal Database (WID), and using Group Policy to have my computers connect to WSUS instead of Microsoft Updates.