It is a traditional stringed musical instrument with a distinctive triangular body.
Typically, it features three strings and 24 frets, and the one pictured is likely a "prima" size, which is the most common.
The instrument is often made from natural wood like spruce or maple and hand-painted with folk art designs, as seen here.
It is used for orchestra, ensemble, and solo performances and is suitable for beginners.
The balalaika produces a bright, rhythmic tone and is widely used in folk and classical music.