There are many types of pistols, each designed for specific purposes. Here are some of the most common types:

1. Single-action pistol: In this type of pistol, the trigger performs a single function, releasing the hammer to fire the gun.

2. Double-action pistol: The trigger performs two functions in a double-action pistol, first cocking the hammer and then releasing it to fire the gun.

3. Semi-automatic pistol: These pistols use the energy from the fired cartridge to eject the spent casing and load a new round into the chamber automatically.

4. Revolver: This is a Pistols with a rotating cylinder that holds multiple rounds. As the trigger is pulled, the cylinder rotates to bring a new round into position for firing.

5. Pocket pistol: A small pistol designed for concealed carry, often used for self-defense.

6. Competition pistol: Designed for competitive shooting sports such as IPSC or IDPA, these pistols have features that optimize accuracy, speed, and ergonomics.

7. Tactical pistol: Often used by law enforcement and military personnel, these pistols are designed for reliability and durability in high-stress situations.

8. Hunting pistol: A pistol designed for hunting small game and varmints. These pistols often have longer barrels and are chambered in rifle cartridges for increased accuracy and power.