Wind instruments are musical instruments that produce sound by the vibration of air. They are typically made of materials like wood, metal, or plastic. Common types of wind instruments include flutes, trumpets, and saxophones. Players create sound by blowing air into or across the instrument, which then vibrates to produce music. These instruments can be categorized into two main groups: woodwinds and brass. Woodwinds, such as clarinets and oboes, use reeds or are played by blowing air across an opening. Brass instruments, like trombones and French horns, produce sound through the buzzing of the player's lips in a mouthpiece.