A "stop" is a term used in various contexts, but it generally refers to a point where movement or progress is halted. In transportation, a stop can be a designated place where vehicles, such as buses or trains, pause to allow passengers to board or disembark. These stops are often marked with signs and may include amenities like shelters or seating. In photography, a stop refers to a unit of measurement for exposure. It indicates a doubling or halving of the amount of light that reaches the camera sensor. Adjusting the stops can affect the brightness of an image, allowing photographers to achieve the desired effect in their photographs.