In electronic commerce, means of achieving greater market penetration through websites who target specific groups of internet users. For example, Amazon.com (which sells books, electronics, pharmaceuticals, toys, and many other items) has thousands of affiliated interest specific websites from where the visitors can reach products offered by Amazon. The entire sales transaction takes place at Amazon's website which is equipped to handle the complete online payment acceptance process. Amazon passes on a percentage of the sold item's price as commission to the affiliate website from where the sale originated.
Some advertisers offer multi-tier programs that distribute commission into a hierarchical referral network of sign-ups and sub-partners. In practical terms, publisher "A" signs up to the program with an advertiser and gets rewarded for the agreed activity conducted by a referred visitor. If publisher "A" attracts publishers "B" and "C" to sign up for the same program using his sign-up code, all future activities performed by publishers "B" and "C" will result in additional commission (at a lower rate) for publisher "A".
And what about joining another company's affiliate program? It's all about extra revenue. Think about your customers' needs: What other products or services would interest your site visitors? Join those affiliate programs. Affiliate programs can increase your sales with no upfront cost to you. It just takes a little time to plan your strategy and select the partners that will have the greatest impact on your business.