What is a knife?

A knife is a tool or weapon with a cutting edge or blade, usually attached to a handle or hilt. It is designed to cut, slice, or stab. Knives have been used for various purposes throughout history, including hunting, food preparation, combat, self-defense, and crafting. They come in various shapes, sizes, and designs, each suited for a specific task or application. Knives can have a single or double edge, and the blade can be made from a variety of materials, including steel, ceramic, or obsidian.