Key Concepts

VMware Tools
A suite of utilities that enhances the performance of the virtual machine's
guest operating system and improves management of the virtual machine.
VMware vSphere
High Availability
An optional feature that supports distributed availability services in an
environment that includes ESXi and vCenter. If VMware Distributed
Resource Scheduler™ is configured and one of the hosts thatvCenter Server
manages becomes unavailable, all virtual machines on that host are
immediately restarted on another host.
VMware vCloud Air Key Concepts
12 VMware, Inc.