Sandpaper is a type of abrasive material used for smoothing and finishing surfaces. It consists of a paper or cloth backing coated with tiny particles of abrasive materials, such as aluminum oxide or silicon carbide. Sandpaper comes in various grits, which indicate the coarseness or fineness of the abrasive surface. 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 automotive applications, sandpaper helps prepare surfaces for painting, staining, or sealing. It is available in sheets, rolls, or discs and can be used by hand or with power tools. Proper selection of grit and technique is essential for achieving the desired finish.