Metal structures are frameworks made primarily from metals like steel and aluminum. They are commonly used in construction for buildings, bridges, and towers due to their strength, durability, and resistance to environmental factors. Metal structures can be prefabricated, allowing for quicker assembly on-site. These structures often utilize various design techniques, such as trusses and beams, to distribute loads effectively. Engineers consider factors like weight, stress, and environmental conditions when designing metal structures to ensure safety and longevity. Proper maintenance is essential to prevent issues like rust and corrosion, which can compromise structural integrity.