# User Acquisition bidding

> Learn about bidding and configure Cost per Install (CPI) bids and Return on Ad Spend (ROAS) goals in the Unity Dashboard.

User Acquisition campaigns use place bids to show ads to users. Refer to the following articles to learn about how bidding works, the different kinds of User Acquisition bids, and how to configure bids in your campaign setup.

[Introduction to User Acquisition bidding](/user-acquisition/bidding/intro-to-bidding.md): Learn about how bidding works with Unity User Acquisition.

[Cost per Install bidding](/user-acquisition/bidding/cpi/cpi-bidding.md): Learn about Cost per Install (CPI) bidding, review the recommended best practices, and configure CPI bids in the Unity Dashboard.

[Return on Ad Spend bidding](/user-acquisition/bidding/roas/roas-bidding.md): Learn about how bidding works for Return on Ad Spend (ROAS) campaigns and set up ROAS goals in the Unity User Acquisition Dashboard.