The easiest thing to do is to sign up for an affiliate marketing network like Commission Junction. They provide a marketplace where your affiliate program will be advertised to other affiliate marketers. They also provide the tracking software for your affiliates so you don’t have to build your own tracking system. In some ways this is better because it takes care of the trust issues. Affiliates are always suspicious of whether or not they’re getting credited for the sales they generate. By having an intermediary take care of transaction tracking and payments, the fear of being cheated is alleviated. 
As of October 2018 almost 4.2 billion people were active internet users and 3.4 billion were social media users (Statista). China, India and the United States rank ahead all other countries in terms of internet users. This gives a marketer an unprecedented number of customers to reach with product and service offerings, available 24 hours a day, seven days a week. The interactive nature of the internet facilitates immediate communication between businesses and consumers, allowing businesses to respond quickly to the needs of consumers and changes in the marketplace.
When you recommend a user to any product (usually membership program or products which require recurring monthly payment), you earn a fixed commission when a referred user pays his next bill. Some of the companies offer a recurring commission for a fixed time (Let’s say one year) & many companies offer the same for a lifetime. It all depends upon company marketing policies.
Affiliate marketing is one of the earliest forms of performance-based online marketing. The 90s ushered in the age of the internet. Organizations and individuals began creating websites and content in droves and – when search engines began cataloging websites and pages, making it easy to find and navigate to this content – marketing changed forever.

Affiliate marketing is commonly confused with referral marketing, as both forms of marketing use third parties to drive sales to the retailer. The two forms of marketing are differentiated, however, in how they drive sales, where affiliate marketing relies purely on financial motivations, while referral marketing relies more on trust and personal relationships.[citation needed]
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