What is an affiliate?
An affiliate is a publisher, creator or site that sends you customers and gets paid only when those customers do something you can measure: a purchase, a sign-up, a booked demo. The affiliate puts a tracked link in front of their audience, the audience clicks through, and if a sale follows, the affiliate takes a cut. Affiliate marketing is the system built around that arrangement: the network that tracks the clicks, the terms that set the commission, and the roster of partners who carry your links.
The model is older than the internet (department stores paid finders' fees long before cookies existed) but it was made for the web. Review sites, deal pages, newsletters and individual creators all run on it. For a brand it is a sales force you only pay on results. For the affiliate it is a way to earn from an audience without making a product of their own.
Why it matters
Why affiliates matter
Affiliates matter because they move the risk. Most advertising charges you for attention whether or not it turns into anything; an affiliate charges you for the outcome. That makes the channel unusually easy to justify to a finance team, and it is why e-commerce brands lean on it so heavily. The other reason is reach into places you cannot buy. An affiliate with a trusted review site or a tight newsletter has an audience that already believes them, and a recommendation in that voice carries weight no banner can match.
The catch is that the channel attracts the lazy as well as the good. A coupon site that intercepts a customer already on your checkout page shows up in the report as a conversion without adding a single new customer. The program has to be curated, not just opened.
In practice
How affiliates work in practice
- 01
A brand sets up a program, usually on an affiliate network or a platform that handles tracking and payouts, and publishes its terms: the commission rate, the cookie window (how long after a click the sale still counts) and what is and is not allowed. Partners apply, get approved and receive their links. Every click carries an identifier, so when a sale happens the platform knows who sent it.
- 02
The day-to-day work is partner management. Good programs recruit the right affiliates on purpose, give them real creative to work with (product films, stills, copy that sounds like the brand), tier the commission so the best partners earn more, and audit the traffic to weed out fraud and coupon leakage. Brands that treat affiliates as a distribution channel for their best creative, instead of a spreadsheet of links, get the loyal partners.
Watch out
What people get wrong about affiliates
Confusing an affiliate with an influencer. An influencer is paid for content and reach, usually up front; an affiliate is paid on results, usually after the fact. The two overlap, and many creators are both, but the contracts and the economics are different. The other mistake is measuring the program by last-click revenue alone. A big number that is mostly coupon sites catching customers at the checkout is a program paying commission on sales it would have made anyway.
