Testing between two sets up options to see which one produces better results.
Affiliate marketing is a type of marketing in which a business rewards (cash or otherwise) affiliates who bring in customers through the affiliate’s own marketing endeavors
The capacity to have an effect, change someone’s mind, or impact their decision.
Promoting an exchange relationship between a seller and a buyer
People following the advice of other people (they may not even know) in order to gain the same benefits (e.g., testimonials)