VMware ESX is VMware’s enterprise server virtualization
platform. The platform is available in two versions — ESX Server and
ESXi Server. VMware ESX and ESXi can be deployed as part of the VMware
infrastructure (vSphere or VMware View) to enable centralized
management for data center applications and enterprise desktops. One main feature of the enterprise server virtualization platform
is that it allows users to contain server sprawl by running software
applications in virtual machines on fewer physical servers.
ESX stands for Elastic Sky X
Apparently, the “i” in ESXi stands for Integrated, probably coming from
the fact that this version of ESX can be embedded in a small bit of
flash memory on the server hardware. In this manner, we can treat
server hardware almost like a hot-swap commodity; just another node.