vCenter Server is the centralized platform for managing a VMware vSphere® environment. It is the primary point of management for both ESXi server virtualization and vSAN™. It is also the enabling technology for advanced capabilities such as vMotion, Distributed Resource Scheduler (DRS), and HA.
vCenter scales to enterprise levels where a single vCenter can support up to 2,500 hosts (VxRail nodes) and 40,000 powered on virtual machines. See VMware Configuration Maximums for the latest recommended limits. vCenter supports a logical hierarchy of data centers, clusters, and hosts. This hierarchy allows you to separate resources by use cases or lines of business and enables resources to be moved as needed dynamically. These resource changes are all performed from a single interface.