# Introduction to Unity's Exchange

> Buy and sell programmatic ads through Unity’s real-time bidding platform.

Welcome to Unity's Exchange documentation hub, where you'll find information about the platform, integration documents, supported features, and best practices to succeed in Unity's real-time bidding exchange. Unity's Exchange provides demand-side partners (DSPs) and exchange bidders access to in-app inventory, a comprehensive range of advertising formats, and 2.5 billion Unity users across 750,000+ apps globally with an average of 165 million daily active users.

Unity Exchange allows DSPs and advertisers to bid on each ad impression. All auctions are first-price auctions, meaning all exchange bidders will have the opportunity to bid and pay the value they decide for an impression. Unity's implementation is based on [OpenRTB 2.6](https://iabtechlab.com/wp-content/uploads/2022/04/OpenRTB-2-6_FINAL.pdf) specification, with some additional specs found in later versions, and might require parameters that are optional for the [Interactive Advertising Bureau](https://www.iab.com/) (IAB).

For more information, refer to [Getting started with Unity Exchange](/grow/programmatic/unity-exchange/get-started.md).