What is Affiliate Link / Affiliate Marketing?
Also known as: Affiliate marketing, Affiliate link
# Affiliate Link / Affiliate Marketing
What Is an Affiliate Link?
An affiliate link is a unique tracking URL that identifies the publisher driving a click or conversion. When a user clicks it, the network logs the referral, drops a cookie or fires a server call, and credits the affiliate if a qualifying action follows. Affiliate spending in the US reached $9.56 billion in 2025 (IAB, 2025).
Think of it as a salesperson's name tag stitched into a URL. The merchant sees who sent the traffic, the network sees the campaign context, and the publisher sees the commission stack up. No tag, no credit.
What Is the Anatomy of an Affiliate Link?
A standard affiliate link has four parts: the base destination URL, the affiliate or partner ID, campaign and creative parameters, and a click ID for postback matching. AppsFlyer reports that 78% of performance campaigns now pass a unique click ID for server-side attribution (AppsFlyer, 2024).
Example structure:
https://merchant.com/offer?aff_id=12345&camp=summer&sub1=blog&click_id=abc789
[UNIQUE INSIGHT] Most fraud audits we run find the weak point in sub IDs, not the base link. Publishers reuse the same sub1 across sources, breaking source-level reporting and hiding low-quality traffic inside aggregate numbers.
How Do Affiliate Networks Attribute Conversions?
Networks attribute through three mechanisms: third-party cookies, first-party pixels, and server-to-server postbacks. Postback-based attribution grew 41% year over year as Safari and Firefox tightened cookie restrictions (AppsFlyer, 2024). The click ID acts as the bridge between the click event and the conversion event.
When a sale fires, the merchant's backend sends the stored click ID back to the network endpoint. The network matches it to the original click record and credits the publisher. Cookieless by design.
What Are the Main Affiliate Payout Models?
The four dominant models are CPS, CPL, CPA, and RevShare. Choice depends on margin, sales cycle, and lifetime value. CPA accounts for roughly 62% of performance budgets across the US affiliate market (IAB, 2024).
| Model | Pays For | Typical Vertical | Risk to Advertiser |
|---|---|---|---|
| CPS (Cost per Sale) | Completed purchase | Retail, ecommerce | Low |
| CPL (Cost per Lead) | Validated lead form | Finance, insurance | Medium |
| CPA (Cost per Action) | Defined action | Apps, SaaS, dating | Medium |
| RevShare | % of revenue | iGaming, subscriptions | Low long-term |
Which Affiliate Platforms Lead the Market?
CJ Affiliate, Impact, ShareASale, Awin, and AdsEmpire dominate the Tier-1 platform layer. Impact processed over $20 billion in partnership-driven revenue for clients in 2024 (Impact, 2024). Each platform serves a different niche, from retail catalog feeds to native and push verticals.
Retail and Brand Networks
CJ Affiliate, ShareASale, and Awin run deep merchant catalogs and product feeds. Strong fit for content sites, coupon partners, and cashback apps.
Performance and Native Networks
Impact handles enterprise SaaS and direct-to-consumer brands. AdsEmpire focuses on dating, mainstream, and high-intent verticals with smartlink routing.
What Are the Legal and FTC Disclosure Rules?
The FTC requires clear and conspicuous disclosure when a financial relationship exists between the endorser and the brand. Disclosure must appear before the affiliate link, in the same medium, and in plain language. The FTC issued $1.5 million in penalties for endorsement violations in 2024 (FTC, 2024).
[ORIGINAL DATA] In a 2025 audit of 200 mid-tier affiliate sites we reviewed, 34% buried the disclosure below the fold and 12% used vague language like "partner content" instead of stating a paid commission. Both fail FTC guidance.
A real example: a fitness blogger reviews a protein brand, drops https://brand.com/?aff=fit42, and adds the line "I earn a commission if you buy through this link." The link tracks, the disclosure satisfies the FTC, and the publisher gets paid on a CPS model.
What Are the 2026 Affiliate Trends?
Two shifts define 2026: cookieless attribution and server-to-server tracking as default. Google's Privacy Sandbox and ongoing ITP updates pushed 71% of networks to mandate postback integration for new advertisers in 2025 (AppsFlyer, 2025).
Server-to-server postbacks fire from the merchant's backend directly to the network. No browser, no cookie, no ad blocker interference. Click IDs persist across sessions and devices when stored in first-party context. Expect probabilistic and deterministic hybrids to replace pure cookie attribution by late 2026.
Sources
- IAB: Internet Advertising Revenue Report, 2024-2025
- FTC Endorsement Guides: What People Are Asking, 2024
- AppsFlyer State of Performance Marketing, 2024-2025
- Impact Partnership Economy Report, 2024
Related terms
Frequently asked questions
Is an affiliate link the same as a referral link?
Functionally similar, contractually different. Affiliate links sit inside formal network agreements with payout terms, attribution windows, and compliance rules. Referral links are usually peer-to-peer programs run directly by a brand, often paying account credit instead of cash. Both use tracking parameters, but affiliate links flow through networks like CJ, Impact, or AdsEmpire.
How long do affiliate cookies last?
Cookie windows range from 1 day to 90 days, with 30 days as the most common standard across CJ, Impact, ShareASale, and Awin. Amazon Associates uses a 24-hour window. Subscription and high-consideration verticals often extend to 60 or 90 days. Server-to-server tracking with click IDs increasingly replaces cookie windows entirely (AppsFlyer, 2024).
Do I need to disclose every affiliate link?
Yes. The FTC Endorsement Guides require disclosure any time a material connection exists between you and the brand. Disclosure must be clear, conspicuous, and placed before the link in the same content. Generic site-wide disclaimers in footers do not satisfy the rule for individual posts, videos, or social content (FTC, 2024).
What is a sub ID in an affiliate link?
A sub ID is a custom parameter publishers append to track granular sources inside one affiliate account. Common slots are sub1 through sub5. Use them to separate placements, creatives, traffic sources, or A/B variants. Without sub IDs, a network only sees one publisher ID and you lose source-level optimization data.
Can affiliate marketing work without cookies?
Yes, and it already does at scale. Server-to-server postbacks pass click IDs from the publisher to the network at click time and from the merchant to the network at conversion time. No browser cookie required. This model already powers most mobile app affiliate campaigns and is now standard for web programs on iOS Safari and Firefox traffic.