A cannon (plural either cannons or cannon) is a large- caliber gun classified as a type of artillery, which usually launches a projectile using explosive chemical propellant. Gunpowder ("black powder") was the primary propellant before the invention of smokeless powder during the late 19th century.
Cannon, big gun, howitzer, or mortar, as distinguished from a musket, rifle, or other small arm. Modern cannon are complex mechanisms cast from high-grade steel and machined to exacting tolerances.
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The history of cannon spans several hundred years from the 12th century to modern times. The cannon first appeared in China sometime during the 12th and 13th centuries. It was most likely developed in parallel or as an evolution of an earlier gunpowder weapon called the fire lance.
A field gun is a cannon if its barrel length is more than 35 times its caliber (the inner diameter, "bore", of its shell pathway). If the barrel length is 10 to 35 times the caliber, it is a howitzer.