WHAT IS WINDOWS SERVER 2016 REMOTE DESKTOP SERVICES ?
Windows Server 2016 RDS CAL is part of the flexible licensing system for Windows Server 2016. It will give customers the opportunity to leverage fantastic enhancements that make it the optimal version of RDS, to date, with several areas of innovation to improve the administrative and client experiences.

This Version ” RDS 2016″ brought innovation centered around three areas: Simplify IT management, User experience, and Improved security.

What is  Remote Desktop Services?
RDS, short for “remote desktop services,” refers to the feature that lets users utilize Windows programs and visual desktops remotely. Using the proper client access licenses, desktop networks may be managed centrally (CALs). Additionally, the 2016 device licenses may be combined with any possible Windows Server 2012 Core licenses that are already in existence. This offers an organization’s IT department more time to upgrade to the most recent server operating system. Future updates will be installed faster thanks to the “Express Updates” capability.

Do I need a Client Access License?
Each user and device that connects to a Remote Desktop Session host need a client access license (CAL). Installing, issuing, and tracking RDS CALs all require an RDS licensing server. The RD Session Host server decides if an RDS CAL is required when a user or device connects to it.

THE DIFFERENCE BETWEEN USER CAL AND DEVICE CAL
License your deployments with Device or User Client Access Licenses
Each user or device accessing a licensed Windows Server requires a Windows Server CAL or a Windows Server and a Remote Desktop Services (RDS) CAL.