Abrasion is a process that occurs when materials are worn away or scraped off due to friction or contact with other surfaces. This can happen naturally, such as when rocks are smoothed by water in a river, or artificially, like when sandpaper is used to smooth wood. The result is a change in the surface texture of the material being abraded. In medical terms, an abrasion refers to a type of injury where the skin is scraped or rubbed off, often resulting in minor bleeding and pain. Common causes include falls, accidents, or contact with rough surfaces. Proper cleaning and care are essential to prevent infection and promote healing of the affected area.