Wind instruments are musical devices that produce sound when air is blown into or across them. They can be made from various materials, such as wood, metal, or plastic. Common examples include the flute, trumpet, and saxophone. Each instrument has a unique sound, which is influenced by its shape and the way it is played. These instruments are often categorized into two main groups: woodwinds and brass. Woodwinds, like the clarinet and oboe, use reeds or are played by blowing air across an opening. Brass instruments, such as the trombone and French horn, create sound through the vibration of the player's lips in a mouthpiece.