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.

Knives were among the first tools used by man in the Stone age, originally consisting of a single piece of sharpened flint.

Knives designed for specific purposes exist in large numbers. Some examples include butchering, hunting, curing, fishing, woodcarving, cooking and combat.