The Face-Centered Cubic (FCC) structure is a type of crystal lattice where atoms are located at each corner and the centers of all the cube faces. This arrangement allows for a high packing efficiency, making it one of the most common structures in metals like copper, aluminum, and gold. The FCC structure has a coordination number of 12, meaning each atom is surrounded by 12 neighboring atoms. In an FCC lattice, the unit cell can be visualized as a cube with atoms at its corners and one atom at the center of each face. This configuration leads to a total of four atoms per unit cell. The FCC structure is known for its strength and ductility, which are important properties in materials science and engineering.