Consumer is the one that purchase the product but he/she is not the user.(e.g:you buy a bottle of red wine to your friend.so, you are the consumer,because of your not the o0ne that use the product)
Customer is the one that buy the product and he/she is the user.(e.g:you bought a "ipod" MP3 to listen music.you are the customer,because your the one that buy and use the product)