A knife is a tool or weapon with a cutting edge or blade, typically made of metal. Knives have been used by humans for thousands of years for a variety of purposes, including hunting, food preparation, and self-defense. They come in many different shapes and sizes, and can be designed for specific tasks, such as slicing bread or filleting fish.Browse and download from the best collection of knife wallpapers photos in hd. There are many different types of knives, such as pocket knives, folding knives, fixed blade knives, kitchen knives and hunting knives. Pocket knives and folding knives are designed for easy portability, while fixed blade knives are typically larger and more durable.You can use any knife wallpapers downloaded.