A knife is a tool with a sharp blade used for cutting. It typically consists of a handle and a blade made from metal or other materials. Knives come in various shapes and sizes, designed for different purposes, such as cooking, hunting, or crafting. The blade of a knife can be straight or serrated, depending on its intended use. Common types of knives include kitchen knives, butter knives, and hunting knives. Proper handling and maintenance are essential for safety and longevity, making knives important tools in many households and professions.