Citrix Hypervisor (formerly XenServer) is a complex server virtualization platform with built-in enterprise-class features that allows you to easily manage mixed operating systems, storage, and data exchange configurations.
Citrix Hypervisor provides an efficient way of building a scalable system, as it can be used on the server hardware without any underlying OS.
This hypervisor is designed to virtualize hardware components like hard drives, ports, devices, etc. making them available to guest operating systems started on it.