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what-is-prebid-js.md

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What is Prebid.js?
What is Prebid.js?
What Prebid.js is, and why it's useful
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Overview

Pre-bid auctions (also known as "header auctions" or "header bidding") run directly on a publisher's page and allow publishers to access external demand that may not be available through their primary ad server.

Prebid.js is a 100% free and open source Javascript framework designed to make it easier for publishers to run pre-bid auctions and get access to more demand with minimal integration hassle.

For more information about how header bidding with Prebid.js works, see How it Works.

Benefits

The benefits of pre-bid auctions include:

  • Access to more demand; partners compete on 100% of the publisher's inventory.

  • Generally higher CPMs and fill rates.

  • More transparency about who is purchasing the publisher's inventory as a result of eliminating "waterfall" methods and estimated CPMs.

  • Reduced discrepancies and pass-backs.

  • Lower transaction costs.

The benefits of using Prebid.js in particular are:

  • 100% free and open source, giving you complete control over how you use it.

  • Clean, built-in support for all major bidders as well as major ad servers.

  • It solves many problems publishers are facing - high latency, unfair auction mechanics, long development time, and confusing line item and targeting setup.

  • Plugging in prebid.js is easy. Adding new header bidding partners is a matter of adding tag IDs to your JSON config.

Bidder Support

Prebid.js has built-in support for most major bidders, including:

  • AOL
  • AppNexus
  • Index
  • OpenX
  • Pubmatic
  • Rubicon
  • Yieldbot

Supported Ad Servers

Prebid.js supports major ad servers such as:

  • DFP
  • OAS
  • AdTech