The knife is any cutting edge or blade, hand or otherwise, with or without a handle. It consists of a thin blade, usually metal, often ending in a point and one or two sharp edges and a handle by which the subject. It has been used as a tool (for example, kitchen utensils) and a weapon from the Stone Age, as excavations have shown in Olduvay, which may be copies with a length of 2 ½ million years.