What is "Multiplayer?"Edit
Multiplayer is the same as single player except that instead of AIs, real people play against other real people. AIs may also be added to multiplayer if more players are required. Multiplayer is a simple term: multi- is an abbreviated version of "multiple," meaning "many," so a "multiplayer" game allows many players to participate.
Differences from Single PlayerEdit
Multiplayer does not offer as much variety in terms of playable maps. Maps like "The British Isles" (included in the Vikings DLC) may not be played; the only maps that are playable are the ones with adjustable sizes. Civilizations from DLC packs may be played in multiplayer; however, this must be enabled in the options menu, and doing so means that players who do not have that DLC may not participate. In-game players may talk using a talk panel beside the Diplomacy screen. Players may also trade and work in teams.