The laws of physics that govern actions of all moving bodies apply to sound. Because sound and all acoustic conditions consistently behave as described by the law of physics, we are able to predict and analyze the nature of a sound and its interaction. A fundamental understanding of the nature of the sound and terms used to describe it is essential to comprehend the language of otolaryngologists, audiologists, music acousticians, and engineers. Moreover, studying the basic physics of the sound helps one recognize complexities and potential pitfalls in measuring describing sound. We will talk about the structure of sound and its components, and we will see the various qualities of sound that make it interesting and useful to understand.