Wikipedia
The çift-hane system was the basic unit of agrarian land holding and taxation in the Ottoman Empire from its beginning. The pre-modern Ottoman system of land tenure was based on the distribution of land between publicly owned lands, miri and privately owned lands mülk, and the majority of the arable land was miri, especially grain-producing land. Peasants were the vast majority of the empire, and they worked as farmers on land designated as miri, relying heavily on wheat-barley production for their subsistence. The peasant household had been the basic form of agrarian production in much of the land ruled by the Ottomans since Roman times, and this had continued through Byzantine rule. So, the çift-hane system was based on the realities which were present in much of the lands the Ottomans conquered: a class of free peasants cultivating their own land, and a taxation policy combining Byzantine, Ottoman, and Islamic rules.