After you create a tag category and create a tag within the category, you can associate the tag with a vSphere managed object or a vSphere Automation resource.
An association is a simple link that contains no data of its own. You can enumerate objects that are attached to a tag or tags that are attached to an object.
Tag associations are local to a vCenter Server instance. When you request a list of tag associations from a vCenter Server system, it enumerates only the associations that it has stored.
When you associate a tag with an object, the object's type must match one of the associable types specified for the category to which the tag belongs.