A cannon is a large, heavy firearm that uses explosive force to launch projectiles, typically made of metal. Historically, cannons were used in warfare to breach fortifications or to engage enemy troops from a distance. They come in various types, including field cannons, howitzers, and siege cannons, each designed for specific purposes. Cannons operate by igniting gunpowder or other propellants within a chamber, creating a rapid expansion of gases that propel a projectile through a barrel. Over time, advancements in technology have led to the development of more efficient artillery systems, but the basic principles of cannon operation remain similar to those used in earlier designs.