Aperture - How big the opening of the lense is.
Shutter speed is measured in seconds.
1/250th of a second is considered fast, while 1/30th of a second is considered slow. A picture cannot be taken under 1/20th of a second without the use of a tripod.
Exposure is the amount of light that reaches the cameras digital sensor. This can be controlled on a camera by different functions.
On a camera usually the shutter speed is label "T" and the aperture labeled "A"
Aperture is usually expressed in F-Numbers.
F/2.1 is large while F/22 is small.
If the aperture is large (for example F/2.1) the shutter speed must be fast (for example, 1/250th of a second). If the aperture is small (for example F/22) then the shutter speed must be slower (for example 1/30th of a second.)
The higher the aperture is the smaller the hole in the camera will be to let light through to the light sensitive surfaces which process the picture.
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