What's the difference between !! and * at /etc/shadow file?

["Monty Ree" <chulmin2 () hotmail com>]

Hello, all.

I have found that  !! and * exist at /etc/shadow file.
and I know that !! is inserted when I lock the user,then what's the 
difference with * ?
Some user is !! but others * at shadow file like below..

daemon:*
sshd:!!:


Thanks in advance.

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