Remote turn on feature

Most AV receivers and external amps have a remote turn on feature. For example, one would connect an A/V receiver to an external amp so that when the A/V receivers powers up the amp also turns on. My question is this, what do you use to make the connection between the two components? I see the actual location behind the components but the actual wire is never provided. I hope my question makes sense.

Thanks,
Khoi

Most of the time it is a mono mini plug and cable.

I can't remember if mine came with my pre/pro or my amp,
but I had one supplied.

I had one come with my pre/pro.