A revolver is a type of handgun with a rotating cylinder that holds several bullets, usually five or six. When you pull the trigger, the cylinder spins to line up the next bullet with the barrel, making the gun ready to fire again without reloading. The name comes from this revolving motion.

Revolvers became popular in America in the 1800s because they were more reliable than earlier pistols. Before revolvers, most guns could only fire one shot before needing to be reloaded, a slow and complicated process. Samuel Colt perfected the revolver design in 1836, and it quickly became widely used by soldiers, lawmen, and settlers on the frontier. Cowboys and sheriffs in the Old West typically carried revolvers, which is why they appear so often in Western movies and books.

The revolver's simple mechanical design made it dependable even in harsh conditions like dust, rain, or extreme cold. While modern pistols use different technology (magazines instead of cylinders), revolvers remain popular today for target shooting and personal protection because they're straightforward to use and less likely to jam.