Aluminium composite panels (ACPs) consist of two thin aluminium sheets bonded to a non-aluminium core. ACPs have benefits over other panel materials like being lightweight, durable, and able to be painted in a wide range of colors. They are commonly used for building exteriors and interiors, signage, ceilings, and more. ACPs offer advantages like beauty, affordability, ease of installation, weather resistance, and low maintenance. Famous structures that have used ACPs include SpaceShip Earth and the German National Library due to ACPs' cost-effectiveness, durability, and design flexibility.