Yeah, a "Glaze" according to Zymol is a very expensive wax. And just to add to the confusion, a "Polish" according to Zaino is really a sealant. But what Patrick said is pretty much what everyone here on Autopia goes by: A glaze is something you put on a car to improve the shine/gloss and to *hide* (not remove) small defects in the paint, but it doesn't offer any environmental protection like a wax or sealant will. If you don't put a wax/sealant over the top of a glaze, they will typically wash off in two or three washes.
Waxes and/or sealants enhance the shine/gloss of a car without the defect hiding abilities of a glaze as well as providing environmental protection.
Most of the time, glazes are followed up with an *appropriate* wax/sealant. It's important that you use the correct type of wax/sealant (LSP-Last Step Process around here) after using a glaze; some types of LSP's won't adhere over certain glazes.