They're both listed in the prep + prime section, but I get the feeling these are supposed to be used instead of foundation? Or are they for use under foundation?
What is the difference between BB cream and CC cream, exactly?
my understanding:
BB is beauty balm - so like a cross between moisturizer/spf/tint
CC is complexion correcting - so also like tinted moisturizer but offers some colour correction, or brightens complexion.
not sure what the difference is between BB and tinted moisturizer...
i heard there are also DD creams coming in to add to the confusion...

apparently like the above but anti-aging...
i have one of the mac CC creams (the peachy one) - i use it sometimes alone to brighten my under eyes, but sometimes under a foundation or tinted moisturizer.