A sound wave is a longitudinal wave in an elastic medium; a wave producing an audible sensation. A sound wave is a form that travels through matter or air. Sound waves have three different kinds of characteristics: wavelength, frequency, and amplitude. A sound wave is formed by the back-and-forth vibration of an object displacing the nearby air particles and setting into motion a longitudinal wave through simple harmonic motion. A good example of vibration is a guitar string when it is plucked. If you were to tighten, loosen, lengthen, and shorten a string of the guitar it would make a different sound every time.
    When hearing a sound many people and animals use their ears to hear sound, or also if a loud sound is made they can perceive it through the sense of touch. Sound waves that are has a long wavelength is known as a low pitch. A sound wave with a short wavelength has a high pitch.

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