Tagging Service
The vSphere Automation Tagging Service supports the definition of tags that you can associate with vSphere objects or vSphere Automation resources. vSphere has a tagging feature but no public API to manage tags. With the vSphere Automation SDK, you can manage tags programmatically.
For example, to tag your VMs by guest operating system type, you might create a category called operating system, and specify that it applies to VMs only. You might also specify that only a single tag can be applied to a VM at any time. The tags in this category might be Windows, Linux, and Mac OS.