see more - http://dailyinfographic.com/exposure-guide-road-to-photography-infographic
As an amateur photographer, I found this infographic to be immensely enlightening as to how cameras work and the terminology that goes along with camera mechanics.
It seems that exposure is usually the first lesson learned when it comes to understanding photography. The shutter speed or exposure time is the amount of time that the camera’s shutter is open–letting light reach the film or image sensor on your camera. As the graph shows, the longer the shutter speed, the more likely you are to get motion blur in your photo.
The aperture of the lens affects the image as well. The larger the opening, the more light will be exposed. So, if you want a more ‘in focus’ picture in daylight, reduce the aperture size so that the image will become darkened as less light enters.