Campaigns are the main entity of CampaignManager Web Portal. It is used to organize the content in terms of format, schedule the time that the content needs to appear on the screens and ultimately publishing the content to the appropriate Player/screen, Dappler/sound card, Android Player/screen or Zusa/screen saver.
In terms of organizing the content, we can place a variety of media types, web sites, etc. Also, the media files have the property of how much time they will air on the screen and in what matter.
Link: Creating Campaign Content