Design patterns are basically best-practice templates that programmers can use to consistently write well-designed code more quickly. The Singleton: Used when you only want to allow access to one instance of a particular class. 3D Animated Corporate Video can be an added value to your sales funnel and also a great marketing collateral. The Factory: The factory pattern makes it easier to create multiple classes without repeating code. To change, rename, or replace the class, simply modify the factory.