Rule Actions & ActionSets
Rule Action is one of the most basic components of a Rule system. You can create a basic rule like “Max Salary of Employee” and publish it in a few minutes. You can also create complex rules like “Send an email” or “Post to FTP” by adding your own scripts in any of your favorite language such as VB or C#. A Rule Action can also be configured to call a service or an App First Datasource.

An Action is inheritable.

On the other hand, a collection of actions is called an ActionSet and when an ActionSet is executed, all Actions within the set will be executed one by one.