Wikipedia
Shareasale
ShareASale is an affiliate marketing network based in Chicago, IL USA. ShareASale services two customer sets in affiliate marketing: the affiliate, and the merchant.
Affiliates use ShareASale to find products to promote, and earn commission for referrals on those products. Affiliates use their own website, blogs, PPC campaigns, SEO campaigns, RSS and email, as well as a number of other means.
Merchants use ShareASale to implement, track, and manage their affiliate program.