A hook is a tool consisting of a length of material, typically metal, that contains a portion that is curved or indented, such that it can be used to grab onto, connect, or otherwise attach itself onto another object. In a number of uses, one end of the hook is pointed, so that this end can pierce another material, which is then held by the curved or indented portion.

Variations

• Bagging hook, a large sickle or reaping hook used for harvesting grain^[1][2]
• Bondage hook, used in sexual bondage play
• Cabin hook, a hooked bar that engages into an eye screw, used on doors^[3][4]
• Cap hook, hat ornament of the 15th and 16th centuries
• Cargo hook (helicopter), different types of hook systems for helicopters
• Crochet hook, used for crocheting thread or yarn
• Drapery hook, for hanging drapery
• Dress hook, fashion accessory
• Fish hook, used to catch fish
• Flesh-hook, used in cooking meat
• Grappling hook, a hook attached to a rope, designed to be thrown and snagged on a target
• Hook (hand tool), also known as longshoreman's hook and bale hook, a tool used for securing and moving loads
• Hook-and-eye closure, a clothing fastener
• Hook and loop fastener
• Lifting hook, for grabbing and lifting loads
• Mail hook, for grabbing mail bags without stopping a train
• Meat hook, for hanging up meat or carcasses of animals in butcheries and meat industry
• Prosthetic hook or transradial prosthesis, part of a prosthetic arm for amputees
• Purse hook, used to keep a woman's purse from touching the floor
• Shepherd's hook (or crook), a staff used in herding sheep or other animals
• Siege hook, an Ancient Roman weapon used to pull stones from a wall during a siege
• Tailhook, used by aircraft to snag cables in order to slow down more quickly