The traffic objective is designed to drive people to a destination. For example, you can send people to your website or increase the number of people going to your mobile app.
Here are options to consider when setting up a campaign with a traffic objective:
Where do you want to drive traffic? You can select either Website or App.
Do you want to target people who already have your app? You can target people (Custom Audience) who previously installed your app by selecting this in the Audience Section of your ad group creation.
For a quick overview of the Traffic advertising objective, watch the video below.