How Affiliate Program Works

Affiliate marketing is a marketing practice in which a business rewards one or more affiliates for each visitor or customer brought about by the affiliate's own marketing efforts. Examples include rewards sites, where users are rewarded with cash or gifts, for the completion of an offer, and the referral of others to the site. The industry has four core players: the merchant (also known as 'retailer' or 'brand'), the network, the publisher (also known as 'the affiliate'), and the customer. The market has grown in complexity to warrant a secondary tier of players, including affiliate management agencies, super-affiliates and specialized third party vendors.

Affiliate marketing overlaps with other Internet marketing methods to some degree, because affiliates often use regular advertising methods. Those methods include organic search engine optimization, paid search engine marketing, e-mail marketing, and in some sense display advertising. On the other hand, affiliates sometimes use less orthodox techniques, such as publishing reviews of products or services offered by a partner.

Affiliate marketing—using one website to drive traffic to another—is a form of online marketing, which is frequently overlooked by advertisers.^[1] While search engines, e-mail, and website syndication capture much of the attention of online retailers, affiliate marketing carries a much lower profile. Still, affiliates continue to play a significant role in e-retailers' marketing strategies.

Source from : http://en.wikipedia.org

As a conclusion, It's all about the methode they use to convince people to join their program. It's the best and 

 easiest methode to earn, BUT!!!! You have to know how you earn ? and how your affilliate provider earn ?

They build a network of many level. When a person subscribe under them, they earn the commisions from the subscriber. Then the subscriber find other subscribers. And the subscribers find other subscribers and it continue non stop. 

Here's the part to know how you EARN $$$  ??, When you find subscribers, they pay the fee to become member, and 30%-70% of the fee goes to you, then the subscribers of your subscriber's fee goes to their affiliate( your subscriber) and to you but only few % and also to your higher affiliate . As a conclusion, you earn free and legal money. 

Thank you for reading!!!