Cubic close packing (CCP) is a method of arranging spheres in a three-dimensional space to maximize density. In this structure, each sphere is surrounded by twelve others, creating a highly efficient packing arrangement. This configuration is commonly found in metals and is also known as face-centered cubic (FCC) packing. In cubic close packing, the spheres are stacked in layers. The first layer is placed flat, and the second layer is arranged in the gaps of the first. The third layer fits into the gaps of the second, repeating this pattern. This arrangement allows for optimal use of space and is important in materials science and crystallography.