Photography involves capturing images using a camera. The key components of a camera include the viewfinder for framing shots, a lens to focus light and create images, and an image sensor that detects the information that makes up the image. Photos and videos are saved to a memory card inside the camera. Lighting is also important, and different types of lenses, exposures, and white balances can affect the look and feel of the final image. Apertures and f-stops control the amount of light entering the camera lens. Photos can be supported hands-free using a tripod, or hand-held by the photographer.