ESXi server is the most important part of vSphere. ESXi is the virtualization server. All the virtual machines or Guest OS are installed on ESXi server. To install, manage and access those virtual servers which sit above of ESXi server, you will need other part of vSphere suit called vSphere client or vCenter. Now, vSphere client allows administrators to connect to ESXi servers and access or manage virtual machines.
https://whmcsglobalservices.co....m/vmware-whmcs-modul