what is the meaning of "loopback" in there?

From: nick (i141802596_at_yahoo.com)
Date: 11/21/05 

Date: Mon, 21 Nov 2005 07:28:03 +0800

These two commands have (-A) appended two ACCEPT rules. The OUTPUT rule
(05) allows any packet to (-o) leave via the "loopback" device and the
INPUT rule (04) allows packets to re-enter (-i) via the "loopback".

04- [bash]# iptables -A INPUT -i lo -j ACCEPT
05- [bash]# iptables -A OUTPUT -o lo -j ACCEPT

thanks!

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