Aperture is the size of the shutter opening, varying if it's small or large. The smaller the number of the aperture on your camera, the bigger the shutter hole which will let more light in compared to a larger number, which has a smaller hole.
Here is an example of a photograph I have taken with a narrow depth of field, using a large aperture - the pencil closest is in focus and as the line of pencils go further away they gradually go out of focus.
The oposite would be a smaller aperture, with a wider depth of field. It would mean more of the objects or things in the photo would be in focus.
This is another photo similar to the one above, but I wanted to experiment other ways so I took one where the pencils further away are in focus rather than the the other way around.
Shutter Speed: Shutter speed is the amount of time the lens hole is open for. So if the lens hole was left open for 1 second, the movement in the photo would be blury where as a shutter speed of 100th of a second would be sharper. Unless there was no movement in the photo.
This is an example of a slower shutter speed, which is shown by the blurriness of the cabs (this was purposely done to show the aliveness of New York).