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Like Age of Empires II, the game is set in the post-classical period. The start and end of the covered time frame is in general shifted slightly forward compared to Age of Empires II, from post-Migration Era to well into the Late Middle Ages and Renaissance, Migration Era civilizations like the Goths and Huns are missing, and equivalent civilizations appear in their post-Migration Era forms (i.e. French instead of Franks, English instead of Britons), and in the Imperial Age, units typically feature more advanced gunpowder technologies and armor designs. The list of notable features in Age of Empires IV includes, but is not limited to:
The game includes five (six for Xbox - the extra is marked with *) single-player campaigns themselves broken down into grouped scenarios. Each campaign covers the events of a historical period from the perspective of the particular civilization and accompanied by documentary-style narration and cinematics:
The Art of War is a special type of campaign across the series to help players learn the basics of the game.
Age of Empires IV launched with eight civilizations. Two were added with the first free expansion and The Sultans Ascend each, with the latter also adding four variant civilizations. Two additional variants were added with the Knights of Cross and Rose expansion.
Age of Empires IV has four Ages, with the same names as in Age of Empires II.