They're not models, they're Objects. A model is an object but all objects are not models. The difference is what sort of role they play in your app. A Servic

They're not models, they're Objects. A model is an object but all objects are not models. The difference is what sort of role they play in your app. A Service Object work, could just echo hello world every 15 seconds and still be called a Service Object, while a model in your application doing the same thing can no longer be called a Model.