Affiliate Program : A Marketing Program
Affiliate Program is a type of performance-based marketing program in which you can receive commission by helping a parent company that generate sales. This method includes the some advertising tools such as banner ads, links, tracking codes for you to place it on your sites, in emails or in the other internet listing.
Whenever the visitor visits your site, and he may clicks the listing clicks or an ad or any link, then the transaction may tracked for it. If that transaction is in a sale for the parent company then you have to pay for that sale.
Your affiliated transaction will be tracked very easily every time as you visit the website, with the help of cookies. Cookies are responsible to to keep track of the information which affiliate link or ad was clicked by the visitor, after that the transaction and sale is made.