Convergence is the process of reconfiguring or converting a vCenter Server instance with an external Platform Services Controller to a vCenter Server instance with an embedded Platform Services Controller.
If you have deployed or upgraded a vCenter Server instance with an external Platform Services Controller, you can convert it to a vCenter Server instance with an embedded Platform Services Controller using either the vSphere Client, or the vcsa-util command line converge utility.
To learn more about converting a vCenter Server instance with an external Platform Services Controller to a vCenter Server instance with an embedded Platform Services Controller, see vCenter Server Installation and Setup.