The Dutar is a traditional folk instrument, a long-necked two-stringed lute found in Iran, Turkmenistan, and Central Asia. Its name comes from the Persian word for "two strings", do tār, although the Herati dutar of Afghanistan has fourteen strings. (Source: Wikpedia)
The Ektara is a one-stringed instrument with a body often made from a gourd or coconut. The Ektara is used in the Hindu practice of Kirtan chanting, and was traditionally played by by wandering folk singers.