3rd-party cookies are set by a domain other than the website you are visiting. In affiliate marketing, they were used to track users across multiple websites and attribute commissions for referrals and sales. These cookies are now considered outdated and are losing relevance as browsers and privacy regulations severely limit their use. By 2025, 3rd-party cookies are expected to be barely used, as modern technologies and privacy rules demand more accurate and privacy-friendly tracking methods. At selecdoo, we rely on contemporary alternatives to ensure transparent and compliance-friendly affiliate tracking solutions.