A cookie in affiliate marketing is a small file stored on a user's device when they click an affiliate link. It helps track their actions, like visiting a website or making a purchase. The cookie holds information, such as the affiliate's ID, so the right person gets credit for the sale. Cookies usually last for a set time, like 30 days, meaning if someone buys within that period, the affiliate earns a commission. This tracking is important because it ensures affiliates are rewarded for their promotions. Different programs have different cookie durations, so it's good to check the details. Understanding cookies helps affiliates see how their links perform and plan their strategies. What do you think about how cookies work in affiliate marketing?