二胡是拉弦乐器。有两根弦，以纯五度定弦，在胡琴之中属于中高音域乐器。

在各地方根据需要的条件，独立发展出不同形状的弓弦乐器，如高胡、京胡、板胡、二弦 等。

Erhu is a stringed instrument with two strings. It is tuned in a pure fifth, a medium-high frequency instrument.

Various Erhu have independently developed of different shapes, such as Gaohu, Jinghu, Banhu, Erxian, trumpet strings, etc., according to needs.