What Is Affiliate Marketing?

By Catherine Brock – Updated Jun 2, 2025 at 11:02 AM

Key Points

Affiliate marketing connects sellers, marketers, and customers using online platforms.
Marketers earn commissions by promoting products through unique links that track sales.
High sales volumes are crucial for marketers to earn significant income from commissions.

Affiliate marketing is the paid promotion of goods and services online. The marketers are typically bloggers, website publishers, and content creators. In this arrangement, the marketer earns income in the form of commissions, while product sellers get brand exposure and sales.

This guide will cover how affiliate marketing works, its pros and cons for marketers and sellers, and the factors that position an affiliate program for success. We'll close with tips for getting started with affiliate marketing.

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Sellers can reach new and different audiences. A specialized blogger or social media influencer may have a following that's not easily reachable by other promotional methods, such as ads.
Sellers pay for performance. Sellers define the payment terms in the affiliate contract. Commonly, sellers only pay commissions for completed and unreturned sales. In that case, all other brand and product exposure that doesn't produce sales is free to the seller.
Marketers can earn without having their own product. Affiliate marketers don't need a product idea or a customer service team. They can earn recurring income via publishing online, which is a low-overhead business.
Marketers can monetize audiences they already have. Influential marketers can usually generate product sales easily by recommending products they know to their followers.

A few downsides of affiliate marketing are:

Sellers have less control over how their products are being promoted. Sellers define promotional rules and decide which marketers are part of their program. However, sellers do not review and approve every piece of information shared about their products. This can allow some marketers to promote the products in ways that conflict with the brand image.
Marketers must deliver a high volume of sales to earn a livable wage. A marketer who produces $10,000 in sales with a 2% commission earns $200. Sales volume must be very high to produce significant income.
Marketers have little control over how well customers convert on sellers' websites. Most affiliate programs pay commissions on sales rather than website visits. But whether customers ultimately make a purchase depends heavily on the experience they have on the seller's website. That experience is outside the marketer's control.

Success factors for affiliate sellers and marketers

Under the right circumstances, affiliate programs can quickly expand a seller's reach and visibility online. To position the program for success, sellers may consider implementing:

Competitive program terms. The best marketers focus their efforts on high-commission and/or high-converting programs. If product margins don't support high commissions, sellers may implement other strategies to help their marketers earn more. Examples include providing support with proven marketing materials, offering free samples, and creating highly optimized checkout pages.
Brand guidelines. Established brand guidelines and a system for spot-checking marketers' promotional efforts can protect brand integrity.
Goals and KPIs. Sellers should define the program goals and track progress via key performance indicators (KPIs). The high-level goal usually involves growth in profitable sales, but other goals can include affiliate conversion rates, lifetime customer value from affiliate referrals, and the number of marketers in the program. Lifetime customer value is the total expected profit from a customer over time, accounting for typical repurchase activity.

For marketers, affiliate promotion can create a steady stream of income, or it can be tedious work that produces little result. Affiliate marketers with these qualities are more likely to be successful:

Access to an audience that trusts the marketer's opinions. That audience can be social media followers and blog readers, for example.
The ability to identify products the audience will appreciate. Marketers who can identify products that match the audience's needs will see better conversion rates and, in turn, higher income.
The ability to evaluate a seller's website. Marketers who focus their efforts on products with easy, streamlined checkout experiences will also see higher conversions of customer visits into sales.

What Is Affiliate Marketing?

Key Points

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Pros and cons of affiliate marketing

Success factors for affiliate sellers and marketers

Related investing topics

Getting started with affiliate marketing

The basics of affiliate marketing