From Vmware site:
Features & Benefits
Virtualize processor, memory, storage and networking resources into multiple virtual machines with VMware ESXi, an enterprise-class hypervisor with a thin 32 MB footprint for added security and reliability.
VMware ESXi is the virtualization platform customers build upon for continuous application availability and infrastructure security. With VMware Infrastructure 3, customers can add the benefits of server consolidation, automatic load balancing and business continuity to ESXi
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