Server-side tracking, most commonly implemented through the Conversions API, moves the point of data collection from the visitor's browser to the advertiser's own backend, which isn't subject to ad blockers, cookie restrictions, or browser-level tracking prevention the way client-side Pixel tracking is. It typically requires more engineering effort to set up correctly than dropping a Pixel snippet on a page.
Verticals with high-value, low-frequency conversions — like iGaming deposits or high-ticket lead gen — invest heavily in server-side tracking because the accuracy gain on a smaller number of high-value events pays for the engineering cost many times over compared to accepting Pixel-only data loss.
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