The one person the Rules of Golf allow to carry your clubs, give you advice, and help you during a round. Rule 10.3 sets the terms: one caddie at a time — you may change mid-round, but not just to borrow a fresh opinion — and you answer for everything your caddie does, so their rules breach is your penalty. The trade runs well past the bag: yardages, green reads, raking bunkers, tending the flagstick, and knowing when to say nothing at all. The word likely arrived in Scotland from the French cadet in the 1600s, along with much of the game's other early furniture.