Scientific interest in nano particles of various shapes and morphology is growing proportionally. Besides the distinct size characteristic, properties of nano particles vary widely with alteration of structural and morphological features. Metallic nano particles’ characteristics are mostly determined by their shapes and sizes. These shape-dependent nano particles hold an impressive potential for to be used in numerous scientific technologies with promising applications. Due to their small size, metallic nano particles have special optical, magnetic, and electrical, strength, surface area, sensitivity, and stability features. Surprisingly, the phase change occurs when bulk materials are converted into nano particles, which means that materials that were previously non-magnetic become magnetic at the nanoscale. Because of their unique features, nanoscale matter is a separate form of matter from the solid, liquid, gaseous, and plasma states.Copper nano particles have drawn tremendous attention over other metals due to their unique and fascinating property known as Localized Surface Plasmon Resonance (LSPR). Mie theory can describe the optical properties of copper nano particles when the size of the nano particle is not too small.In this study, a critical overview the optical properties of copper nano particles from a theoretical approach (Mie scattering theory) and experimental investigations were intensively reviewed.Additionally, classifications, synthesis techniques, characterization methods of nano particles, and applications of copper nano particles in various fields are offered.