A string instrument is a musical instrument that makes sound by vibrating the strings on it. The strings are plucked to produce sounds. Each string has a different frequency. The desired frequency can be obtained by adjusting the tension on the string. A string instrument plays soft notes. The strings on the instrument usually come in many shapes and forms. There are many types of stringed instruments like Acoustic Guitar, Electric Guitar, Bass Guitar, Violin, Veena, Cello, Double Bass, Mandolin, Ukulele, and Bouzouki & etc..