A campaign is a promotional activity conducted by a merchant through Cuelinks, offering a payout to affiliates for every sale, install, or lead generated via an affiliate link within a specified time frame. Typically, there are three types of campaigns offered by merchants on Cuelinks: Cost per Sale (CPS), Cost per Install (CPI), and Cost per Lead (CPL). Affiliates can choose to promote campaigns based on their content niche, audience interest, and payout offered.