Services/factories in Ionic are used to abstract common business logic and integration to the backend services. A data access layer and business logic layer can be implemented using Ionic service or factory. Ionic service or factory can be used interchangeably and are available as a method on the
Generally, a service is used to represent the data access layer whereas a factory is used to implement the entity layer or business logic layer. Both objects are singleton in nature, meaning only once instance is created throughout the app's life cycle, which is shared between multiple controllers or other angular modules.
We will take the example of our BookStore App to create an authentication service ...