VMWARE released vSphere 6.7, getting a lot of new functions and improvements, this also gives us a new vCenter Server Appliance.
In many smaller setups, we run what is called and embedded appliance, where all vSphere vCenter Server funtionalites coexist on one single VM, this is VMWARE’s guide how to upgrade and embedded appliance 
VMWARE’s blog post, about 6.7:
https://blogs.vmware.com/vsphere/2018/04/introducing-vmware-vsphere-6-7.html