Citrix XenServer, is a type-1 hypervisor that facilitates server virtualization. It enables the creation and management of virtual machines (VMs), enhancing the efficiency and performance of virtualized environments. Key features include live migration, resource pooling, and high availability. XenServer consolidates multiple VMs on a single physical server, simplifying disk image management. It integrates seamlessly with existing networking and storage infrastructures, ensuring zero downtime maintenance through live VM migration. Overall, XenServer offers a robust and scalable solution for data center virtualization.