An affiliate tracking cookie is a small piece of data stored on a user’s device that tracks their interactions with an affiliate partner’s marketing efforts. This cookie helps attribute conversions or sales to the correct affiliate by recording the user’s journey from click to purchase.

Affiliate tracking cookies are essential for ensuring accurate commission payouts and measuring the effectiveness of affiliate campaigns. For instance, if a user clicks on an affiliate link and makes a purchase within the cookie’s duration, the affiliate will receive credit for the sale.