The speed of sound is a physical property defined as the rate at which sound waves propagate through a medium. This speed is not constant; rather, it depends significantly on the material's characteristics, including its bulk modulus, density, and temperature. Generally, the speed of sound increases as the elasticity and rigidity of the medium increase, meaning it travels faster through solids compared to liquids, and slower through gases. The phenomenon is fundamental to acoustics and has applications in fields ranging from non-invasive medical diagnostic imaging to the analysis of structural integrity.