Knife

A knife is a sharp object used for cutting things, based on the simple machine concept of a wedge. The most common design for a knife is that of a sharp metal blade attached to a handle by means of a tang. Knives have been used as weapons and tools since the stone age, and various developments include the sword and the machete.

Together with the fork and spoon it is a very common eating utensil. According to etiquette it is held in the right hand, and the fork in the left.A knife is such a basic tool that it is helpful in almost any environment.Knives were among the first tools used by man in the Stone age, originally consisting of a single piece of sharpened flint.