All cameras are basically a box that light can not get into until a photo is taken. There is a hole on one side of the camera where the light can get in through the lens, and this is called the aperture. On the other side is a special material that can record the image that comes through the aperture. This material is the film in a film camera or electronic sensor in a digital camera. Finally, there is also the shutter, which stops light from getting in until a photo is taken.