Need of CC or BCC in emails.

CC means carbon copy and BC means blind copy. If you are sending an email out to some one why would you CC them if you can just put there email in the "TO" space along with everyone your sending it to? and blind copy is just dumb. Explain it?

In a business environment To: is used for the main persons you're communicating with on a matter. Cc: would be used for other names who just need to know about the issue, but who are not actually in the conversation. 

Some people use Bcc: to send to many people without each seeing the other's address, but it could also be used to cause mischief by copying an active conversation to someone else secretly.

BCC is a very good thing to use. 
You can send the email to many people, but they cant see the email addresses of the other people, to whom it was sent.