Answer: Guitar.
Some extra relevant information:
The musical instrument that commonly features six strings is the guitar. The guitar is a versatile string instrument that is highly popular across various genres of music. With its distinctive sound and wide range of playing styles, the guitar has become an integral part of both acoustic and electric music. From classical to rock, from jazz to folk, the guitar’s six strings offer musicians the ability to create rich harmonies, complex melodies, and powerful rhythms. Whether you’re a beginner or an experienced player, learning to play the guitar can bring endless joy and creative expression to your musical journey.