What are the differences between a dhow, a caravel, and a junk?

A dhow is a traditional sailing vessel used by Arab
countries.  It typically had one or more lateen sails.  "Lateen sails are triangular
sails set on a long yard mounted at an angle on the mast, and running in a fore-and-aft
direction."  These sailing vessels are still used today to carry cargo around coastal
areas.

A caravel is a sailing vessel utilized by the
Portuguese to carry cargo.  It typically had two or three lateen sails (which are
mentioned above).  They were agile and easy to navigate.  They were used for oceanic
exploration.

A junk is a traditional Chinese sailing
vessel.  It was utilized to sail the oceans and for distance. It's sails have rigid
members that span the width of the sail and extend the sail forward of the
mast.