A knife is a tool with a sharp blade used for cutting, slicing, and chopping. It typically consists of a handle and a blade made from materials like stainless steel or carbon steel. Knives come in various shapes and sizes, designed for different tasks, such as kitchen knives for food preparation and pocket knives for everyday carry. Knives have been used by humans for thousands of years, evolving from simple stone tools to modern designs. They are essential in many professions, including cooking, woodworking, and outdoor activities. Safety is important when using a knife, as improper handling can lead to injuries.