The campaigns in the Age of Empires games are separate series of scenarios based on historical or mythical events that feature cinematic cutscenes, narrative elements, often special objectives, and unique units.
The Campaign Editor (contained in the Scenario Editor) allows players to create custom campaigns.
Age of Empires II: Definitive Editioncontains all of the original campaigns from Age of Empires II, with new ones added: The Art of War and The Last Khans. Unlike the original game, a completed scenario selection will be marked with a bronze, silver or gold medal depending on whether the scenario was beaten on the "standard", "moderate" or "hard" difficulty respectively. If an entire campaign is completed, the selection of the campaign will also feature a medal, depending on which difficulty types the scenarios within were completed the most.