What are BB creams suppose to do?

I just bought one from L'oreal...and it looks like i am wearing foundation? is that what BB cream is suppose to do, make it look like you are wearing foundation without being as heavy as foundation? or is it suppose to just smooth out your skin and make it look...natural? I was hoping it was the 2nd case. does... show more I just bought one from L'oreal...and it looks like i am wearing foundation? is that what BB cream is suppose to do, make it look like you are wearing foundation without being as heavy as foundation? or is it suppose to just smooth out your skin and make it look...natural? I was hoping it was the 2nd case. does it also have to be an exact match to your skin tone, because i picked up the fair one, but i am not totally fair, should have picked the next shade which was a bit darker... could that be causing the foundation like appearance? i thought l'oreal is suppose to adjust to your skin tone. any suggestions for a better cream than the one from l'oreal

thanks
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