VMware esxi 6.0 iso is an installer file of the VMware operating system used to install a server. VMware esxi can only be installed on hardware that has a Lan card (Ethernet) in real and can not be installed on virtual machines.
VMware server is very useful for managing networked virtual computers such as cloud systems or to create Virtual Private Servers (VPS). VMWare server has a GUI look like linux desktop so it remains easy to use.
It is recommended that you install VMware server on hardware that has high compatibility so that it does not make it difficult when installing. You can download the VMware server via following link.