There are three licensing options for vSphere 6.0 :
Standard Edition : Contains 1 vCenter Server Standard license, up to 2 vCPUs for Fault Tolerance, vMotion, Storage vMotion, HA, VVols, etc.
Enterprise Edition : Same as Standard Edition additionally APIs for Array Integration and Multipathing, DRS, and DPM.
Enterprise Plus : Includes all Standard and Enterprise Editions features with additional Fault Tolerance up to 4 vCPUs and 64GB of RAM. It also includes Distributed vSwitch and the most expensive licensing option of vSphere 6.0.
