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Cross-Domain Tracking

Cross-domain tracking allows analytics platforms to follow a single user across multiple related sites without breaking their session or creating duplicate IDs. This prevents analytics tools from treating interactions like separate visits when users move between a main site and a checkout subdomain, partner portal, or support hub. For example, an eCommerce store may have its product site on one domain and payment gateway on another, yet track conversions smoothly. Correct setup ensures accurate funnel reporting, attribution, and remarketing audiences.

As privacy and cookie rules evolve, cross-domain tracking now relies more on first-party data, server-side tagging, and user consent. Businesses that implement it well get cleaner attribution models and more precise campaign insights. Without it, you may see inflated traffic numbers and misleading conversion paths.