What is CC and BCC in an e-mail?

We always email or send letter and cc or bcc someone. So what does it mean?

CC means Cover Ca-chng (Backside)
BCC means Better Cover Ca-chng (Backside)

Saw this on YouTube - a Singapore movie "Just follow Law". Click on link to view on YouTube http://www.youtube.com/watch?v=SjVQsvgIfkM