Microsoft Dynamics CRM 2015 has 4 type of processes, which are Workflow, Dialog, Actions & Business Process Flow. First 3 Types are discussed in these Slides
10. Dialogs
•Dialogs contain a collection of pages.
•Each page can contain multiple sets of prompts and responses.
•Can have child dialogs.
•Must be invoked manually.
15. Actions
•Can be associated with single entity.
•or Can be global .
•Supports invocation of plugins pre/post execution.
•Can be executed using a JavaScript web resource.
•Supports input and output arguments.
•Supports auditing of data changes.
•Isn’t supported with offline clients.
•Can be invoked by a web service method call.