Server-side tracking
Server-side tracking sends conversion and analytics events from a server you control instead of the visitor's browser: a more durable transport for the same events, not a way around consent.

Server-side tracking sends analytics and conversion events to ad platforms from a server you control, instead of (or alongside) scripts running in the visitor's browser. The event itself doesn't change (a purchase is still a purchase), but the transport does: server-to-server requests survive ad blockers, Safari's ITP cookie caps, and script failures that silently eat browser-sent events.
#A more durable transport, not invisible tracking
Server-side tracking changes how events travel, not what you're allowed to collect. Consent requirements apply identically: a denied user is denied on every transport. What server-side actually buys is signal durability: the browser is a hostile delivery environment (blockers, seven-day cookie lifetimes, consent-script ordering bugs), while your server is not. Meta's Conversions API and Google's server-side endpoints exist precisely so the same conversion can take the durable route. It's a decision with a price (infrastructure to run, plumbing to maintain), not a default every stack needs.
In practice: Buron ships a first-party pixel backed by a production server-side pipeline, so the events feeding its warehouse don't depend on what a browser felt like delivering that day.
Whether server-side is worth it for your stack (benefits, costs, and the cases where client-side-only is still fine) is the full decision page: Server-side tracking: what it fixes, what it costs, and whether you need it. The implementation route via Google's tag infrastructure is Server-side tagging with sGTM: setup, costs, and when it's not worth it, and the whole conversion-signal territory routes from Conversion tracking & signal quality.
Related terms
Conversions API (CAPI)
The Conversions API is Meta's server-to-server channel for conversion events: a second transport for the same events the pixel sends, not a replacement for it.
Server-side tagging (sGTM)
Server-side tagging runs your tag manager in a cloud environment you own: one event stream in from your domain, fanned out to your ad and analytics platforms from your server. Infrastructure for server-side tracking, not the same thing as it.
Tracking pixel
A tracking pixel is a tiny image or script that fires an HTTP request when a page loads or an event happens, carrying the URL, referrer, timestamp, and identifiers back to a collection server.