What is a key feature that distinguishes a revolver from a pistol?

A revolver is distinctly characterized by its rotating cylinder, which is a key feature that differentiates it from semi-automatic pistols. In a revolver, the cylinder holds multiple rounds of ammunition and rotates to align each round with the barrel for firing. This design allows for several shots to be fired without needing to manually reload after each shot.

In contrast, a typical pistol, such as a semi-automatic, utilizes a magazine that feeds rounds into the chamber directly, often allowing for faster reload times and a higher capacity without the need for a manual cylinder rotation. The concept of a rotating cylinder is fundamental to understanding the operation and mechanics of revolvers, making it a crucial distinguishing feature.