A scheduled campaign is configured to repeatedly deploy to a static set, or segment of users. It can be deployed daily, weekly or monthly. The campaign will deploy the same message on each deployment to whoever meets the criteria of the audience segmentation.
For example, all users whose birthday it is today, or all users who are using iOS.
This type of campaign must be setup including audience, sender options, interactions and message before it can be deployed. The schedule itself can be customised at campaign setup.