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So I think you mean “convection” a convection microwave is telling you that it has a second heating source, usually a radiant element. This means the microwave will also bake like an oven and brown foods, vs. a traditional microwave that just has 1 heating source. A magnetron that disperses microwaves to cook food but isn’t the best for making things crispy. Almost all convection units feature a stainless steel interior, so it’s a quick way to tell if it has the extra cooking modes.