Cookie Stuffing is a form of affiliate fraud that occurs when an affiliate network uses tracking cookies to place an affiliate code on a user's computer without their knowledge or consent. This is done with the intent to gain commission from any sales that occur due to the user visiting a website. In essence, an affiliate network will place a tracking cookie on a user's computer with their own affiliate code, and if the user visits a merchant site and makes a purchase, the affiliate network will receive a commission as if they had referred the sale. This type of fraud can be difficult to detect, as it is done without the user's knowledge. For example, an affiliate network may place a tracking cookie on a user's computer while they are browsing a website. Then, when the user visits a merchant's website, the affiliate network will receive a commission, even though the user did not click on an affiliate link. This fraudulent activity can lead to lost revenue for both the merchant and the affiliate network, as the affiliate is not entitled to the commission they have received.