Affiliate Marketing

Affiliate marketing is a revenue model in which a website earns a commission for referring visitors to a merchant who then makes a purchase. The publisher embeds tracked links (affiliate links) in their content; when a reader clicks one and completes a qualifying action — usually a purchase, sometimes a sign-up or free trial — the merchant pays the publisher a percentage of the sale or a fixed fee.

Amazon’s Associates program, launched in 1996, established the model that most affiliate marketing still follows. A product review site links to a product on Amazon using a unique tracking ID. If the reader clicks and buys, the site earns a commission (currently 1-10% depending on product category, down from 4-15% before Amazon’s 2020 commission cuts). Amazon’s program remains the largest by participant count, but its commissions are among the lowest. Higher-value affiliate programs exist in software (20-50% recurring commissions are common for SaaS products), financial services ($50-200+ per lead for credit cards and insurance), and web hosting ($65-200 per sign-up for hosts like Bluehost or SiteGround).

The editorial integration of affiliate marketing distinguishes it from programmatic advertising. Display ads are separate from content — the reader sees them as ads. Affiliate links are embedded in the content itself, typically in product reviews, comparison articles, “best of” lists, or buying guides. This means the content is the advertisement, which creates both higher conversion rates (the recommendation carries editorial credibility) and ethical tensions (the publisher has a financial incentive to recommend products that pay higher commissions rather than products that best serve the reader). The U.S. Federal Trade Commission requires disclosure of affiliate relationships, and Google’s guidelines require that affiliate links use rel="sponsored" or rel="nofollow" attributes.

Affiliate marketing produces the highest RPMs of any common web monetization model — $30-100+ for well-executed product review content targeting commercial-intent searches. But it is also the most editorially demanding. It requires producing genuinely useful comparative content (which requires actually evaluating products), targeting search queries with clear purchase intent (which means competing against other affiliate sites and the merchants themselves), and maintaining content freshness (product lines change, prices shift, programs alter their terms). A successful affiliate site is, in effect, a consumer advisory service that happens to be funded by merchant referral fees.

The model’s vulnerability is platform dependency in two directions. Organic traffic from Google delivers the visitors — and an algorithm change can remove them. The merchant’s affiliate program provides the revenue — and a commission cut can halve income overnight. Amazon’s April 2020 commission reduction (from 8% to 3% in some categories) destroyed the economics of hundreds of Amazon-focused review sites within weeks. Diversifying across multiple affiliate programs, building an email list for direct audience access, and developing proprietary data or expertise that competitors cannot replicate are the standard mitigations.

Related terms

• Conversion rate — the metric that determines whether affiliate content translates clicks into revenue
• Revenue per mille — the metric used to compare affiliate earnings against other monetization models
• Programmatic advertising — the contrasting model where ads are separate from content
• Content strategy — the editorial planning that determines what affiliate content to produce
• SEO — the discipline that drives organi