(If you have questions or a comment... post it below, and we'll answer you ASAP!)
Chrysler gives a two letter code to each model, and we Jeepers use that code to tell the Jeeps apart. I'll ask, "Do you have a WJ?" and you'll need to tell me, "No, I have a ZJ". If you're new to Jeeping and you're not sure how to tell what code letters your Jeep is, here is a chart to keep it simple:

Or check out wikipedia's list:
http://en.wikipedia.org/wiki/List_of_Jeep_vehicles