Affiliate marketing is a performance-based model in which a person or business (the affiliate) earns a commission by driving traffic, leads, or sales to another company's product or service. The affiliate promotes the product, a customer follows a tracked link, completes a purchase or action, and the affiliate receives a cut of the revenue. No sale, no pay. That simplicity is why the model has spread across every corner of e-commerce, finance, gaming, and media.
The core parties in any affiliate arrangement
Three roles make the system work. The merchant (also called the advertiser or brand) owns the product and sets the commission rate. The affiliate (also called the publisher) promotes the product through a website, email list, social channel, or app. The customer clicks, buys, and often has no idea the affiliate relationship exists. A fourth party, the affiliate network, sometimes sits between merchant and affiliate, handling tracking, payments, and compliance.
The merchant only pays when a pre-agreed action happens. That makes affiliate marketing one of the lowest-risk customer acquisition channels available to brands, particularly smaller ones with tight budgets.
How tracking works
Every affiliate is assigned a unique tracking link. When a visitor clicks it, a cookie is stored in their browser. If that visitor buys within the cookie window (commonly 30 days, though it varies), the sale is attributed to the affiliate and the commission is recorded. Some programmes use server-side tracking or coupon codes instead of cookies, especially as browser privacy rules have tightened since third-party cookies became harder to rely on.
Commission structures vary widely. Cost per sale (CPS) pays a percentage of each completed transaction. Cost per lead (CPL) pays a flat fee for a sign-up or form submission. Cost per click (CPC) pays for traffic regardless of conversion, though it's less common in pure affiliate arrangements. In the iGaming sector, for example, revenue share deals pay the affiliate a portion of the operator's net profit from referred players month after month, which is why NGR (net gaming revenue) is such a closely watched metric for affiliates operating in that space.
Common affiliate channels
Content websites and blogs are the oldest affiliate channel. A review site recommends a product, embeds a tracked link, and earns on conversions. Coupon and deal sites aggregate discounts and earn when shoppers redeem codes. Price-comparison engines work similarly. Email newsletters have become a significant channel since they deliver warm audiences with high purchase intent. Social media creators, podcast hosts, and YouTubers now run affiliate programmes directly with brands, often disclosing the arrangement with a short caption. The disclosure requirement isn't optional: in the United States, the FTC requires clear, conspicuous disclosure whenever a material connection exists between an endorser and a brand.
Affiliate marketing in the gaming and gambling industry
The online gambling sector has built one of the most developed affiliate ecosystems anywhere. A casino aggregator connects operators to game content at scale, while affiliate partners drive player registrations through review sites, bonus guides, and comparison tools. Commissions in this vertical are substantial: revenue share rates between 25% and 45% of a referred player's lifetime net losses are common, which makes player value and retention central to every deal.
Compliance is tight. Regulated markets require affiliates to hold their own licences in some jurisdictions, display responsible gambling messaging, and avoid targeting vulnerable audiences. Operators who rely on affiliates also need to meet their own obligations under KYC and AML frameworks, which means the affiliate relationship doesn't insulate either party from regulatory scrutiny.
The difference between an affiliate and an influencer
The two overlap but aren't the same. An influencer is paid for reach or brand association, often through a flat fee regardless of conversions. An affiliate earns only on results. In practice, the same person can operate both ways: a creator might take a flat sponsorship fee from one brand and an affiliate commission from another. The distinction matters for accounting, tax treatment, and how a campaign's return on investment gets measured.
Advantages and limitations
For merchants, the appeal is clear: the cost is tied directly to output, and the affiliate bears the cost of content creation and audience building. For affiliates, the appeal is passive income potential. A well-ranked article or well-built email list can generate commissions long after the initial work is done.
The limitations are real, though. Merchants surrender some brand control when affiliates create their own promotional content. Affiliate fraud, including cookie stuffing, fake leads, and self-referrals, costs the industry an estimated $1.4 billion annually according to the Performance Marketing Association. Affiliates, meanwhile, face the risk of programme changes: a merchant can slash commission rates or close a programme entirely, wiping out income that took years to build. Amazon did exactly this in April 2020 when it cut commission rates across dozens of product categories with less than a week's notice.
Key terms every affiliate marketer needs to know
- EPC (earnings per click): the average commission earned for every 100 clicks sent to an offer. A useful benchmark when comparing programmes.
- Conversion rate: the percentage of referred visitors who complete the target action.
- Cookie window: the period during which a sale can still be attributed to an affiliate after the initial click.
- Chargeback: a reversed commission, triggered when a customer returns a product or a lead is found to be invalid.
- Sub-affiliate: a publisher who joins a network through an existing affiliate rather than directly, with the original affiliate earning an override on sub-affiliate commissions.
Affiliate marketing rewards publishers who build genuine audience trust. A recommendation that reads like a transparent, honest assessment converts at a higher rate than one that reads like an ad. That's not idealism; it's what the click-through data consistently shows.