A wind instrument is a type of musical instrument that produces sound by the vibration of air. Musicians create sound by blowing air into or across the instrument, which can be made from materials like wood, metal, or plastic. Common examples of wind instruments include the flute, trumpet, and saxophone. Wind instruments are categorized into two main groups: woodwinds and brass. Woodwinds, such as the clarinet and oboe, typically use a reed or a mouthpiece, while brass instruments, like the trombone and French horn, rely on the player's lip vibration against a mouthpiece. Each type has its unique sound and playing technique.