Virtualization essentially lets one computer do the job of multiple computers, by sharing the resources of a single computer across multiple environments. Virtual servers and virtual desktops let you host multiple operating systems and multiple applications locally and in remote locations, freeing you from physical and geographical limitations.

In addition to energy savings and lower capital expenses due to more efficient use of your hardware resources, you get high availability of resources, better desktop management, increased security, and improved disaster recovery processes when you build a virtual infrastructure.

VMware ESX

Create the foundation for the dynamic and automated data center with VMware ESX - the market leading hypervisor, production-proven at thousands of customers of all sizes. VMware ESX abstracts server processor, memory, storage and networking resources into multiple virtual machines, forming the robust foundation of the VMware Infrastructure 3 suite.

VMware ESX (pdf - 125kb)