A power sander tool used to smooth, polish or clean the surface, whether it is wood, plastic, or metal. Sanders are also used to scrape surfaces for finishing. There are three main types of electric sanders: a disc sander, a belt sander, and an orbital sander. An electric sander is used to smooth and finish surfaces. To remove material from the surface, the sander quickly moves a piece of sandpaper in a circular motion. You can use power sanders in a wide variety of industries, including carpentry and auto body repair. An orbital sander is useful when a random orbital sander is not suitable and only light sanding is required.