what is the difference between EU4 and EU4 extreme edition?

[biton]

extreme edition includes some dlc or what? ty, sorry for my eng.

[Qoojo]

From the steam store page:

The Digital Extreme Edition includes the following:

STAR AND CRESCENT - 50 new Muslim themed event pictures, as well as several new events for the Muslim nations

HORSEMEN OF THE CRESCENT UNIT PACK - 12 unique cavalry modes for the Ottoman, Mamluk, and Persian nations. This enhances the visual experience of EUIV.

CONQUEST OF CONSTANTINOPLE MUSIC PACK - 3 tracks containing 10 new minutes of music masterly composed by Andreas Waldetoft

[Alex]

The only reason to get it is for Star and Crescent. Muslim nations are unplayable without it.

[Sohei]

Muslim nations are still playable without it in my opinion but certainly can be a challenge.