From: confused about service vs factory http://stackoverflow.com/questions/13762228/confused-about-service-vs-factory

gistfile1.js

/**
 * @see http://docs.angularjs.org/guide/dev_guide.services.creating_services
 * Lastly, it is important to realize that all Angular services are application singletons.
 * This means that there is only one instance of a given service per injector.
 */

// code snippet from: http://stackoverflow.com/a/13763886
app.service('myService', function() {

  // service is just a constructor function
  // that will be called with 'new'

  this.sayHello = function(name) {
     return "Hi " + name + "!";
  };
});

app.factory('myFactory', function() {

  // factory returns an object
  // you can run some code before

  return {
    sayHello : function(name) {
      return return "Hi " + name + "!";
    }
  }
});