A catapult is a generic term for siege machine that launches an object through the air using tension, torsion, or gravity.Catapults come in many different shapes and sizes, but they all use some form of stored energy to propel their payload. 
while trebuchet is a specific type of catapult that uses a counterweight to launch its projectile. It consists of a long arm with a sling on one end and a heavy weight on the other.The design of a trebuchet allows it to launch projectiles of greater weights and further distances than that of a traditional catapult.It was a most common powerful siege weapon until the advent of gunpowder.
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