A combo microwave is a device that performs at least one additional task in addition to heating food like in a typical microwave oven. It could consist of a microwave and air fryer set, a microwave and a grill, or any other set of gadgets. A convection microwave is a 2-in-1 appliance that combines the functionality of a microwave and a convection oven. In other words, it can cook and heat food using a fan that circulates hot air, much like a convection oven.