amp install kit

Hello! As is the case with so many, I've visited this forum for many months, looking at reviews and troubleshooting strategies, and just generally soaking up knowledge. I've started a website (which I'm under the impression I'm not allowed to link to or advertise without permission... Could...

Okay, I feel really stupid asking this question but I can't figure out why every amp installation kit out there seems to include one Butt Connector. What is the purpose of this item in these kits? The only thing I could come up with was for the remote wire to wire into the head unit harness...