Platform Services Controller (PSC) is a component of the VMware Cloud Infrastructure Suite. PSC deals with identity management for administrators and applications that interact with the vSphere platform.
The PSC includes common services used across VMware vCloud Suite®. This includes VMware vCenter Single Sign-On™, licensing, and certificate management. PSCs replicate information such as licenses, roles and permissions, and tags with other PSCs.
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What’s New in the VMware vSphere® 6.0 Platform
http://www.vmware.com/files/pdf/vsphere/VMware-vSphere-Platform-Whats-New.pdf
VMware Platform Services Controller 6.0 FAQs (2113115)