An eraser is an object, usually a piece of rubber or plastic, which is used for removing something that has been written using a pencil or a pen. a large, flat, pink India-rubber eraser. = rubber
An instrument used to remove ink from a writing surface, either (traditionally) a metal scraper or (more recently) a special pen dispensing a chemical that eradicates ink
The kneaded eraser (or putty rubber) is a tool for artists. It is usually made of a grey or white (though can be found in many different colors, ranging from green to blue and hot pink) pliable material that resembles putty or gum. It functions by "absorbing" and "picking up" graphite and charcoal particles. It does not wear away and leave behind eraser residue, thus it lasts much longer than other erasers. Kneaded erasers can be shaped by hand for precision erasing, creating highlights, or detailing work. They are commonly used to remove light charcoal or graphite marks and in subtractive drawing techniques. However, they are ill-suited to completely erasing large areas, and may smear or stick if too warm. Though they do not wear away like other erasers, they can become exhausted and unable to absorb any more graphite or charcoal. In that case a kneaded eraser will actually make marks instead of erasing them. These erasers are however particularly long lasting as they can be washed. A soaking in a more substantial cleansing soap such as dishwashing liquid, with manipulation of hand initially, provides worthy results