vCenter Host Gateway is a vCenter Server feature that lets you manage virtual environments that consist of various types of hypervisors.
vCenter Host Gateway is distributed as a virtual appliance. After you deploy and configure the vCenter Host Gateway appliance, you can use the vSphere Web Client to manage both VMware and third-party hypervisors, such as Microsoft Hyper-V.
You can also use the public API to manage third-party hypervisors. For more information, see vSphere Management SDK Documentation.