How Affiliate Links Work?

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Updated: August 2026Oleksandr Honcharov, CEO at FlawlessMLM Affiliate links work through a specific tracking mechanism that identifies which affiliate referred each converting visitor. Understanding how affiliate links work covers URL parameters, cookies, attribution windows, and cross-device tracking.In short: affiliate links work by embedding a unique affiliate ID in the URL as a parameter (like ?tag=affid or ?aff=affid). When someone clicks, the destination site reads the parameter and stores a tracking cookie in the visitor's browser identifying the referring affiliate. If the visitor completes a qualifying action within the cookie window (usually 30-90 days), the network attributes the action to that affiliate.The URL structure is the visible part. An affiliate link looks like `https://example.com/product?tag=youraffid` or `https://example.com/?aff=youraffid&redirect=product-page`. The parameter name (`tag`, `aff`, `ref`) varies by program.The cookie is the invisible part. When someone clicks the affiliate link, the destination site's server sets a tracking cookie in the visitor's browser containing your affiliate ID and the click timestamp.The cookie window determines how long the cookie remains valid for attribution. Amazon Associates cookies last 24 hours (extendable to 90 days if the item is added to cart). ShareASale merchants typically offer 30-90 days. Impact and PartnerStack often extend to 90 days.Attribution rules determine which affiliate gets credit when multiple affiliates refer the same person. Most programs use last-click attribution: the last affiliate whose cookie is set gets credit. Some use first-click attribution.Cross-device tracking limits affect how affiliate links work. If a visitor clicks on mobile and purchases on desktop, most cookies don't follow across devices. Some programs use logged-in account matching to bridge this gap.In MLM, distributor referral links work similarly but with multi-level implications. The referred person's future purchases and their downline's purchases all flow through the compensation plan back to the original distributor.Common mistakes to avoidIgnoring cookie duration — a 24-hour cookie loses substantial commissions on considered purchases.Missing cross-device tracking limitations — mobile clicks that convert on desktop often don't attribute back.Cloaking links without disclosure — FTC requires clear disclosure regardless of link format.Sharing broken or expired links — check links quarterly since programs sometimes restructure URLs.Confusing MLM referral tracking with single-tier affiliate links — MLM links track multi-level activity across a distributor's genealogy.Conclusion: how affiliate links work — unique tracking parameters embed your affiliate ID in URLs. Cookies store the ID in visitor browsers. Attribution windows determine how long clicks count. In MLM, referral links track multi-level activity across the distributor's downline, not just single-tier commissions.Related questionsWhat does an affiliate link actually contain?A URL parameter identifying you as the affiliate (`?tag=affid`, `?aff=affid`, `?ref=affid`) plus the destination URL. Some links redirect through the network for tracking.How long do affiliate link cookies last?Varies by program. Amazon Associates: 24 hours. Most other programs: 30-90 days. Longer cookies capture more considered-purchase conversions.Can I shorten affiliate links?Yes, using URL shorteners (Bitly, TinyURL) or link management plugins (Pretty Links, ThirstyAffiliates). Always disclose the affiliate relationship.How do affiliate links work differently in MLM?MLM referral links track multi-level activity across the compensation plan. One referred person's future purchases and their downline's activity all flow through the plan back to upline distributors.