vSphere Update Manager pairs with vCenter Server to enable patch and version management of ESXi hosts and virtual machines.
vSphere Update Manager 6.5 can remediate the following objects:
VMware Tools and VMware virtual machine hardware upgrade operations for virtual machines running on ESXi 5.0 or later
ESXi host patching operations for hosts running ESXi 5.0 or later
ESXi host upgrade operations for hosts running ESXi 5.0 or later
vSphere Update Manager performs host remediation over the network. vSphere Update Manager must be connected to ESXi and vCenter Server.