# Introduction to ROAS goals

> Understand how bidding works for Return on Ad Spend campaigns.

A return on ad spend (ROAS) campaign goal targets users who are predicted to generate revenue through in-app purchases or by watching ads. This type of campaign strategy uses dynamic bids to acquire users at the best price. A ROAS campaign goal includes two optimization types: in-app purchases (IAP) and ad revenue.

Whether you specify an ad revenue or in-app purchase optimization type, revenue-based campaigns can help you to achieve your return on ad spend (ROAS) campaign goals.

Another way to describe this campaign strategy is the revenue a player generates in their first seven days playing your game, divided by the cost to acquire that player.

For instructions on how to set your ROAS targets, refer to the [ROAS](/user-acquisition/campaigns/roas/return-on-ad-spend-campaigns.md) documentation for your optimized campaign goal.