Rojava :The Democratic Federation of Northern Syria, most commonly known as Rojava, is a de facto autonomous region consisting of three autonomous regions in northern Syria
SDF : The Syrian Democratic Forces
Are a multi-ethnic and multi-religious alliance of predominantly Kurdish, but also Arab and Assyrian-Syrian militias, as well as smaller Turkmen, Armenian, Circassian and Chechen groups / participation in the Syrian civil war. The SDF consists mainly of the People's Protection Units (YPG) and is led by them militarily.
The fighters are mainly Arabs from towns & villages west of Deir-Ez-Zor.