apt sources.list problem

[Bhushan Kulkarni <bhushan_kulkarni@phreaker.net>]

Hi ,
	I am using Debian Woody 3.0 r1 .My problem is below
when i cat /etc/apt/sources.list it shows me following output

# CDROMs are managed through the apt-cdrom tool.
deb cdrom:[Debian GNU/Linux 3.0 r1 _Woody_ - Official i386 Binary-3
(20021218)]/ unstable contrib main non-US/contrib non-US/main
	     ^^^^^^^^
deb cdrom:[Debian GNU/Linux 3.0 r1 _Woody_ - Official i386 Binary-2
(20021218)]/ unstable contrib main non-US/contrib non-US/main
deb cdrom:[Debian GNU/Linux 3.0 r1 _Woody_ - Official i386 Binary-1
(20021218)]/ unstable contrib main non-US/contrib non-US/main
             ^^^^^^^^
	     Why there is unstable and not stable ??
Is this implies that i am using unstable packages ??
Please Help me .