An affiliate is the partner of a merchant or commercial purpose website through an affiliate program.
Affiliate promotes the merchant’s products or services on their websites by the means of visual elements or various promotion tools (widgets, search engine…) which are provided by the merchant. Affiliates are paid by the merchant when referrals become customers or do a sought action (newsletter subscription, webform,..).
The main affiliate programs count about several ten thousands of affiliates.
For more details see affiliate marketing