Sandpaper is a type of abrasive material used to smooth or polish surfaces. It consists of a paper or cloth backing coated with tiny particles of abrasive substances, such as aluminum oxide or silicon carbide. Sandpaper comes in various grits, which indicate the coarseness or fineness of the abrasive material. Lower grit numbers are rougher and remove material quickly, while higher grit numbers are smoother and used for finishing touches. Commonly used in woodworking, metalworking, and DIY projects, sandpaper helps prepare surfaces for painting or staining. It is available in sheets, rolls, or discs, making it versatile for different applications. Proper use of sandpaper can enhance the appearance and durability of finished products.