What's the audio input for in my 2005 Honda Accord?

I've tried using it with my iPod, but it doesn't works, I don't know if it's the cable or that it's not for the iPod.

All of the items installed at the factory, Airam, are fully explained in the owner's manual. There are cables for different generation of audio systems. My 2008 Mercury has the port for a cable. I have connected early generation IPods but a new IPhone has a different plug. The "audio input" is generic. Cables must connect correctly with the appropriate plug for each side, the car and the device. Read the manual and if you need further technical advise, please stop by any car audio shop.