The vCenter Server has an internal user database that allows you to add and manage users with the vSphere Web Client. User management and SSO is provided by the PSC, which has been available since vSphere 6.0. In a large environment, you might want to connect your virtualization infrastructure to a centrally managed AD.
We have already covered basic active directory integration in Chapter 5, Configuring and Managing vSphere 6.7, so let's focus on advanced topics.