Bound, Unbound, Idle, Listening,

Hi Guys,
I am studying netstat and I am getting confused a lot. I will be glad if someone will be kind enough to explain to me :

1) bound port
2) unbound port
3) idle
4 listening

I will very much appreciate it. Thanks guys

This really sounds like homework. If it is please repost it in the homework section.
Otherwise explain why it is not.

This is not a homework. I am doing self study at home using linuxcbt.com
Thanks very much.

A socket can be in various states (bound to an address/port, unbound, listening, idle, etc.)

Other than ESTABLISHED, here are some other possible states that netstat can output:

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