Windows Server 2016 Core Minimal Installation
Windows Server Core is a minimal installation option. Windows Server Core includes most but not all server roles. Server Core has a smaller disk footprint, and therefore a smaller attack surface due to a smaller code base
Server Core installation eliminates any services and other features that are not essential for the support of certain commonly used server roles. For example, a Hyper-V server doesn't need a graphical user interface (GUI), because you can manage virtually all aspects of Hyper-V either from the command line using Windows PowerShell or remotely using the Hyper-V Manager.There is no desktop in Server Core, by design. While maintaining the capabilities required to support traditional business applications and role-based workloads, Windows Server Core does not have a traditional desktop interface. Instead, Server Core is designed to be managed remotely through the command line, PowerShell, or a GUI tool (like RSAT or Windows Admin Center).
Server Core deployments are ideal for enterprises that need to deploy and maintain a large number of servers. Microsoft recommends Server Core for servers that require minimal administration once deployed for specific infrastructure roles, such as domain controllers and certificate authorities.
This Azure Windows Server Core Server also comes pre-installed with the latest Azure Powershell Modules. Small disk size of 30GB.
Windows Server Core Server support is from How to Windows Server Core on Azure