The dSLR Rookie way of looking at aperture is in every lens there is a circular curtain that can change in size, similar to the human eye pupil. And that the aperture is commonly refered to as the lowercase letter (f).
The (f) number is apart of a formula that is measured in terms of a ratio. For example if (f)=(x) it means the aperture is 1:(x). That That is why the (f) number acts inversely to the size of your aperture. However, if that is too confusing just remember the below statement.
Smaller the (f) number ===> the Wider the circular curtain ===> causing More light to get though.
Larger the (f) number ===> the Smaller the circular curtain ===> causing Less light to get though
Put your SLR to "Aperture Priority" and start taking shots at different (f) values. Look carefully at what your shutter speed is doing as you change the aperture value and see what is happening to your shots. The next page gives some example and further explanation of what is happening.
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