Structural materials play a fundamental role in the design and construction of buildings, infrastructure, and engineered systems. Their primary purpose is to provide strength, stability, and durability, ensuring that structures can safely withstand loads, environmental conditions, and long-term use. From steel and concrete to timber and advanced composites, each material is selected based on its mechanical properties, cost-effectiveness, and suitability for specific applications. By choosing the right structural materials, engineers and designers can create safe, efficient, and sustainable structures that meet both functional and aesthetic requirements.