The octave mandolin is a stringed instrument that belongs to the mandolin family. It is tuned an octave lower than a standard mandolin, giving it a deeper, richer sound. Typically, it has eight strings arranged in four courses, similar to the mandola and mandolin, and is often used in folk, bluegrass, and traditional music. This instrument is played with a pick and can be used for both melody and accompaniment. The octave mandolin is popular among musicians for its versatility and unique tonal qualities, making it a valuable addition to various musical ensembles.