Dabiq is the name of a place in Syria where, according to the Judgement Day prophecy as mentioned in the Hadith, the final battle will take place between the Muslims and the Roman Empire (i.e. the West). When this battle has taken place, the Mahdi will return and bring victory on those who oppose the Sharia.

Note that the name of this place is the same name of ISIS’ online magazine, which highlights ISIS’ goals in bringing victory and restoring Islam’s golden age in the form of the new Caliphate.