VMware software provides a completely virtualized set of hardware to the guest operating system.
VMWare is a company that produces virtualization software. Atm this incudes: * vSphrere (old name ESX) * ESXi (free version of vSphere), * VMWare Workstation, * VMWare Player (free. Used for one VM) * VMWare Fusion.
VMware fusion is for OSX. VMare player and workstation are for Linux and Windows vSphere is a type 1 hypervisor (no OS needed).