Aperture Priority is a camera shooting mode that allows photographers to set the aperture while the camera automatically adjusts the shutter speed for proper exposure. This mode is useful for controlling the depth of field, which affects how much of the image is in focus. A wider aperture (lower f-number) creates a blurred background, while a narrower aperture (higher f-number) keeps more of the scene in focus. This mode is particularly popular among photographers who want to emphasize their subject by isolating it from the background. It is commonly used in portrait and landscape photography, making it a versatile choice for various shooting situations.