Question:What is the difference between Factory, Service and Provider? 

Answer Factory - A factory is a simple function which allows you to add some logic before creating the object. It returns the created object.

When to use: It is just a collection of functions like a class. Hence, it can be instantiated in different controllers when you are using it with constructor function.

Service - A service is a constructor function which creates the object using new keyword. You can add properties and functions to a service object by using this keyword. Unlike factory, it doesn’t return anything.

When to use: It is a singleton object. Use it when you need to share a single object across the application.
For example, authenticated user details.

Provider - A provider is used to create a configurable service object. It returns value by using $get() function.

When to use: When you need to provide module-wise configuration for your service object before making it available. 

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