A nylon-string guitar, often called a classical or Spanish guitar, acoustic guitar uses nylon strings instead of steel strings. Nylon-string guitars have nylon or synthetic strings, offering a softer and mellow tone than steel strings' brighter and more metallic sound.
Nylon guitars produce a warm, intimate sound, rich harmonics, and a balanced tonal range. The nylon strings offer a softer attack and less sustain than steel strings, resulting in a mellower and more delicate sound. This makes nylon guitars well-suited for classical, flamenco, and fingerstyle playing styles.