Specify the Type of Object

Specify the type of object to which you are assigning the subscription.

What type of object does the subscription act on:

Applies to all instances of class
Applies to all instances of the class, either a document class or a custom class. Includes all versions of the class, if a document.
Applies to a single instance of object
Applies to only one version of an object.
Applies to all versions of object
Applies to a versionable series. An instance subscription applies to only one version of a document, whereas this option applies to all versions of a document.
Workflow
Select Workflow only if you're creating a subscription to launch a workflow. A workflow is a business process launched by the Process Designer. If you choose this option, you must have a workflow definition created and transferred to the Content Engine server.