Truck hitch

Can someone tell me what a curt hitch is? I came across the term in one of our truck magazine but I really have no idea what exactly it is. I dare not ask my husband because I'm pretty sure he'll just chuckle at me for my lack of know-how when it comes to vehicles.

But I don't really care. I have enough to worry about. When it comes to my car, I trust my mechanic, that's it. I'd rather pay the professional to do a good job rather than having somebody inexperienced to toy with it.