A fishhook or fishhook is a device for catching fish by putting the bones into the mouth or, more commonly, by hooking the body of the fish. Fishers have been using hooks to catch freshwater and saltwater fish for centuries. In 2005, the fishhook was selected by Forbes as one of the top 20 tools in human history. A hook is usually attached to some form of line or bait, connecting the caught fish to the angler. There are many kinds of hooks in the fishing world. Size, design, shape and material depend on the intended use of the hook. The hooks are widely used in fishing, from general fishing to extremely limited and specialized applications. The hook is designed to accommodate various types of artificial, processed, dead or live baits (bait fishing); serve as the basis for artificial predation of fish (flies); or attach or integrate them into other devices that represent fish predation (bait fishing).

Fishing hook usually refers to: its tip is to pierce the sharp end of the fish mouth or meat; barb, the protruding part extending backward from this point, can prevent the fish from unhooking; eye, the ring at the end of the hook connected with the fishing line or bait; elbow and calf, the connecting point of the hook and the eye part; gap, refers to the distance between the handle and the tip. In many cases, a hook is described by using these different parts of the hook, such as a wide gap, a long handle, a hollow point, or an outward curved eye.

According to the use, modern hooks can be made of high carbon steel, vanadium alloy steel or stainless steel. Most high quality hooks are covered with some form of corrosion-resistant surface coating. Corrosion resistance is required not only in the use of hooks, especially in salt water, but also in the storage of hooks. In addition, paint on color and / or provide aesthetic value for hook. Hooks designed for fresh water should be varnished at least, but they should also be painted with gold, nickel, Teflon, tin and other colors.