WVD

WVD is a newer/better way to provide virtual desktops than traditional Remote Desktop Services (RDS). It removes a lot of the complexity of deploying RDS.

Validation environments (pools) are a separate pool of VMs from the production VMs that allow Windows updates to be tested for a subset of users before being released to the production pool.

Host pool type can be personal or pooled. Pooled takes advantage of Win 10 multi-session capabilities to allow a single VM to host multiple sessions.

Desktop app groups allow you to limit access to defined groups of apps as opposed to providing access to a full Windows desktop.