Double-action refers to a mechanism commonly found in firearms, where pulling the trigger performs two actions: it both cocks the hammer and releases it to fire the bullet. This design allows for quicker shooting since the shooter does not need to manually cock the hammer before each shot. In addition to firearms, the term "double-action" is also used in other contexts, such as in pistols and revolvers. In these cases, double-action mechanisms enhance efficiency and ease of use, making them popular choices for self-defense and law enforcement applications.