Cross :
CC = Carbon Copy ; the contents of this field will typically be visible to all the recipients of the message sent.
BCC = Blind Carbon Copy ; the contents of this field are stripped from visibility of all the other recipients so that the addresses remain undisclosed.

I absolutely hate it when my email address comes up in that CC field. I know that is how I've ended up on a few mailing lists due to unscrupulous practices by some rather unsavory individuals.

Regards,
chefer