In modern archery, a compound bow is a bow that uses a levering system, usually of cables and pulleys, to bend the limbs. ... The pulley/cam system grants the user a mechanical advantage, and so the limbs of a compound bow are much stiffer than those of a recurve bow or longbow.
What does a compound bow do?
Today thecompound bow is themost popular type ofbowin America, hands down. Acompound bowis anybowthat incorporates cams, cables, and/or a pulley system on thebow. The goal of these components is to decrease the amount of weight the archer holds at full draw, thus making aiming much easier.