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I too was in the mystery of "Binning". Untill Roger Groom explained it very well to me.
think of a Naughts and Crosses game 3 squares by 3 squares, 1x1 is one square by one square, meaning that 1 pixel is just that 1 pixel, 2x2 is 2 pixels by 2 pixels giving 4 pixels all up but only counting it as 1 pixel. 3x3 is 3 pixels by 3 pixels having 9 pixels all up but only counting those 9 as 1 pixel. so on and so forth.
Hence the more binning you do the more sensitive your ccd is, though at a catch your CCD reduces in size due to the above explanation.
I hope this laymans explanation is good enough! It cirtainly cleard things up on my end.!
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