Shark skin, known as dermal denticles, is a unique feature of sharks that provides both protection and hydrodynamic advantages. These tiny, tooth-like structures cover the shark's body and help reduce drag while swimming, allowing for faster and more efficient movement through water. The texture of shark skin is rough, similar to sandpaper, which also helps to prevent the growth of algae and barnacles. This natural design has inspired various applications in technology and materials, including biomimicry in swimsuits and medical devices, aiming to replicate its beneficial properties for human use.