Semi-Automatic Mode refers to a setting in various devices, such as cameras and firearms, where the user has some control over the operation while the device performs certain functions automatically. In photography, for example, this mode allows the photographer to adjust settings like aperture or shutter speed while the camera automatically manages other aspects, such as exposure. In firearms, semi-automatic mode means that one bullet is fired with each pull of the trigger, and the firearm automatically chambers the next round. This mode provides a balance between manual control and automatic operation, enhancing user efficiency and effectiveness in both contexts.