What Is Affiliate Marketing and How Does It Work?

Affiliate marketing is a performance-based arrangement where a business pays a commission to third parties — called affiliates — who promote its products or services and drive sales or leads. The affiliate earns money only when someone they refer takes a specific action, which makes it a low-risk channel for the business: you pay for results rather than for exposure.

Affiliate marketing underpins a large chunk of online revenue across the UK. Price comparison sites, voucher code platforms, review blogs, and influencers all operate as affiliates for brands ranging from major retailers to niche subscription services. Understanding how it works can help you decide whether to run your own affiliate programme, join one as a publisher, or both.

How the Affiliate Model Works

The mechanics are straightforward. A merchant (the business selling a product) joins or creates an affiliate programme and provides affiliates with unique tracking links. When a visitor clicks an affiliate’s link and completes a purchase (or another defined action, such as signing up for a trial), the affiliate is credited with a commission. The tracking is handled by a cookie placed in the visitor’s browser, which ties the conversion back to the referring affiliate.

Commission structures vary by industry and product type. Physical product retailers typically pay three to ten per cent of the sale value. Software and digital products often pay higher rates — sometimes 20 to 50 per cent — because their margins are larger. Lead-based programmes pay a flat fee per qualified enquiry. The commission structure needs to be generous enough to attract good affiliates while still being profitable for the merchant.

Running an Affiliate Programme as a Business

If you want to recruit affiliates to promote your business, you have two main options: join an affiliate network or build a programme in-house using dedicated software. Affiliate networks — such as Awin, CJ Affiliate, or Tradedoubler — give you access to thousands of publishers who are already looking for products to promote. In-house solutions such as Impact, ShareASale, or Rewardful (popular with SaaS businesses) give you more control and typically lower fees.

The quality of your affiliates matters enormously. A handful of relevant, high-traffic partners will outperform hundreds of low-quality directories. Invest time in recruiting affiliates who already reach your target customer: niche bloggers, specialist YouTubers, and comparison sites in your product category are far more valuable than generic coupon sites that attract bargain-hunters unlikely to become loyal customers.

Becoming an Affiliate Publisher

On the other side of the equation, businesses with a website, newsletter, or social media audience can earn income by promoting other companies’ products. Content sites, email newsletters, and YouTube channels with engaged audiences can generate meaningful passive income by recommending relevant products and earning a percentage of each sale.

The key to success as an affiliate publisher is trust. Recommending products solely for the commission, without genuine belief in their quality, damages the relationship with your audience and ultimately reduces conversions. The highest-earning affiliates are those whose recommendations are trusted because they are consistently honest and relevant. Under UK advertising standards, affiliate links must be disclosed — usually with a clear note that the link is affiliate-based.