I was not familiar with convection ovens before using this product. It comes with a regular oven on the bottom, and a combo microwave/convection oven on the top, along with different accessories to use, depending on whether you need to microwave something or use the convection oven feature. You just select "Upper Oven - Microwave" or "Upper Oven - Convection" to be able to choose which feature to use. For "Lower Oven," you select "Bake" and set the temperature. It has been very handy to be able to have extra space for baking and microwaving with the roomy interior. For the lower oven, there are three movable racks so that you can make more room for large items or stack several pans or casserole dishes in at once. I am really looking forward to inviting family guests over for special events now that I have so much baking room!