On the bottom of my acoustic electric guitar there are two inputs?

Question

One is for the amp but I don;t know what the other is for. It has three prongs in it. Can someone tell me what this is for?

Answer 1

you mean outputs.  You are not sending sound TO the guitar, but FROM it.

Sounds like you have an XLR jack and a 1/4" jack.

Does it look like this:  http://upload.wikimedia.org/wikipedia/co...

IF so - its an XLR - just another kind of connector

Answer 2

That's an XLR jack, it's meant for running directly to a PA preamp or mixer board.