VMware vCenter Orchestrator is an automation tool that provides a set of workflows that can be used to automate the configuration and management of vSphere infrastructure. It uses vCenter Server APIs that cover almost every operation.
The table at the following link leads to an article from the VMware documentation that lists key Orchestrator features:
Two main components of vCenter Orchestrator are the workflow library and workflow engine . They allow the creation and running of workflows to automate processes. Workflows can be run on different objects accessible to Orchestrator via plugins.
There is a standard set of plugins. Because of the open architecture of Orchestrator, third-party plugins can be used as well.
The following diagram shows the Orchestrator architecture:
