The offer of free shipping is one of the best ways to increase traffic to any site. The point of using this method is that the users who log in to this site are buyers of your product. The existence of a free service gives users a very high incentive to buy site traffic. This has been proven in many marketing studies. Many products can be used to increase sales volume with this marketing method. From booksellers to furniture sales websites, they can use this method to increase their buyers.