已索引

Operating System: Software designed to allocate physical resources to application
Application: Software that runs on an operating system, consuming physical resources
Virtual Machine: Specialized application that abstracts hardware resources into software
Guest: The operating system that runs in a VM(also called the guest operating system)
Hypervisor: Specialized operating system designed to run VMs
Host: Physical computer that provides resources to the ESXi hypervisor

VMware: Company name
vSphere: Sever virtualization product of VMware that combines the ESXi hypervisor and the vCenter Server management platform (简单地说，vSphere是服务器虚拟化套件)
Cluster: Group of ESXi hosts whose resources are shared by VMs
vSphere vMotion: Feature that supports the migration of powered-on VMs from host to host without service interruption
vSphere HA: Cluster feature that protects against host hardware failures by restarting VMs on hosts that are running normally
vSphere DRS: Cluster feature that uses vSphere vMotion to place VMs on hosts and ensure that each VM receives the resources that it needs.