In AngularJS, a Factory is a type of Service that returns an object, function, or value to other parts of your application. Factories are useful for organizing and sharing code across multiple components or controllers in your application.

Here’s a comparison table between Factories and Services:

	Factories	Services
Returns	An object, function or value	A new instance of the constructor function
Singleton	No, new instance every time it is injected	Yes, only one instance per injector
Usage	Creating singletons or returning objects, functions or values	Creating objects, functions or values that need to be instantiated multiple times
Definition	Defined using the factory method of the module object	Defined using the service method of the module object

Here’s an example of how to create a Factory in AngularJS:

angular.module('myApp', [])
  .factory('myFactory', function() {
    var factory = {};
    factory.sayHello = function() {
      return "Hello World!";
    };
    return factory;
  });

In this example, we’re creating a factory called myFactory that returns an object with a method sayHello that returns the string “Hello World!”.

We can then use this factory in other parts of our application like this:

angular.module('myApp')
  .controller('myController', function($scope, myFactory) {
    $scope.message = myFactory.sayHello();
  });

In this example, we’re injecting the myFactory factory into a controller called myController and using the sayHello method to set the $scope.message variable to “Hello World!”.

Overall, Factories are a great way to create reusable code in your AngularJS application.