Shutter speed is the speed with which the camera's shutter opens when the picture is taken.
Visually it might resemble blinds you have over your window. Aperture is the size of the hole light passes through in your camera lens before it gets to the shutter. The bigger the hole the more light. It is important to control the amount of light to the film by using the aperture and shutter speed or you will get an incorrect exposure. You probably have seen a dark picture or light picture, these are illustrations of incorrect exposures.