# Concepts and definitions
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This section describes key concepts and defines terminology specific to this solution:

 **custom headers** 

Amazon CloudFront can be configured to add custom headers, which enable you to send and gather information from your origin that you don’t get with typical viewer requests.

 **header bidding** 

Header bidding is a process that enables publishers to capture bids for ad units from demand sources that might otherwise have been missed. By implementing header bidding, a publisher can gather bids from multiple sources that will then compete directly with bids from the ad server

 **Prebid Server** 

Prebid Server is an open source solution for server-to-server header bidding.

 **wrapper** 

A wrapper is a type of Software Development Kit (SDK) for advertising. A wrapper provides browser code to consolidate multiple header bidding partners into a unified framework. It simplifies the management of ad placements and real-time bidding across different ad networks, optimizing ad revenues by allowing simultaneous bids on inventory.

**Note**  
For a general reference of AWS terms, see the [AWS Glossary](https://docs.aws.amazon.com/general/latest/gr/glos-chap.html).