Alto is a term often used in music to describe a vocal range that is higher than a tenor but lower than a soprano. Singers in the alto range typically have rich, warm tones and can perform a variety of styles, from classical to pop. In choral music, altos play a crucial role by providing harmony and depth to the overall sound. In addition to music, "Alto" can refer to various products and brands. For example, Alto is a popular brand of cigarettes known for its smooth flavor. There is also Alto, a ride-sharing service that focuses on safety and comfort for passengers.