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# Prebid S2S (Server-to-Server)
- URL: https://www.adlingo.org/glossary/prebid-s2s/
- Published: 2025-01-15T10:01:00.000Z
- Updated: 2025-01-15T10:01:00.000Z
- Description: A server-side implementation of Prebid that moves header bidding auctions from the browser to a dedicated server.
- Author: Travis Lusk
- Tags: Programmatic, #glossary, #Import 2026-10-27 17:05

Header bidding moved off the browser and onto a server. The client-side implementation runs in the user's browser, which adds page latency and is subject to ad blockers. S2S moves the auction to a dedicated server, reducing latency and removing the browser dependency. The trade-off is that cookie-based targeting is harder to execute server-side. The right implementation depends on your publisher's traffic profile and what your demand partners support.