A "shutter" is a device used in cameras to control the amount of light that reaches the film or digital sensor. It opens and closes at specific intervals, allowing photographers to capture images with varying exposure times. The speed at which the shutter opens and closes can significantly affect the final photograph, influencing factors like motion blur and brightness. In addition to cameras, shutters are also found in buildings, where they serve as protective coverings for windows and doors. These architectural shutters can be made from various materials, such as wood or metal, and help regulate light, enhance privacy, and improve security.