Composite structures (structural engineering) is a class of structural elements or systems fabricated from two or more distinct constituent materials, such as fibers embedded in a matrix, which are combined to leverage their synergistic properties for enhanced performance under mechanical loads. Within structural engineering, this concept pertains to the design, analysis, and construction of components that exploit the unique combination of material characteristics, such as high strength-to-weight ratio, stiffness, or durability, which are not achievable with the individual constituents alone. The behavior of these structures is extensively studied using principles of mechanics modeling, a fundamental aspect of structural analysis, and may involve considerations from acoustic analysis when investigating vibration or sound transmission characteristics, representing a significant area of research and application in modern structural engineering.