# Overview

RTB is a way of buying and selling ads through real-time auctions, meaning transactions are made in the time it takes to load a webpage around 100 ms.

This specification contains a detailed explanation of a real-time bidding interface. Not all objects are required, and each object may contain a number of optional parameters.

To assist a first-time reader of the specification, we have indicated which fields are essential to support a minimum viable real-time bidding interface for Native Ads.

A minimal viable interface should include the required parameters.

Optional parameters may be included to ensure the parties derive maximum value.

<figure><img src="https://lh7-rt.googleusercontent.com/slidesz/AGV_vUfO4kPFXaj_BwPGfeRovIHjfsnx53QtV70AUDWUUS63mYm_1XmklkdjnDoC5A0fj1zbO_uQ6Y0xJ4vdlw4ipIV3cFom4BptYbqpk6nlPYCeCEgGHJNBVzrQ6dJpVgHfgWg48mQ7-mYCexDrYisdwyGUEsr9r_4=nw?key=jP2NKdD2eg5wGGrzRllcQw" alt=""><figcaption><p><strong>Figure 1: Example of how Required and Optional attributes are presented.</strong></p></figcaption></figure>

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