Attribution in affiliate marketing is the process of assigning credit for a customer's purchase or other desired action to the last affiliate that referred the customer. This allows marketers to measure the effectiveness of their affiliates and reward them for successful campaigns.For example, let's say a customer clicks on an affiliate's link to purchase a product from a merchant's website. The customer may have seen the product from another affiliate's website or through an advertisement. As long as the customer clicked on the affiliate's link before completing the purchase, that affiliate can be attributed for the sale. The affiliate can then be rewarded for the successful promotion of the merchant's product.This type of attribution is also useful for measuring the effectiveness of a particular affiliate's campaigns. Marketers can track which affiliates are driving the most sales or leads, and use this information to decide which affiliates should be rewarded or given additional resources. This helps marketers to ensure that they are getting the most out of their affiliate relationships and that they are rewarding their affiliates for the right campaigns.