You may be familiar with the over-the-range microwave ovens. However, you are unsure of the distinction between an over-the-range microwave oven and a standard microwave oven. And as a result, you're unsure about which one to buy. A microwave mounted on a rack, or the wall is called an over-the-range microwave oven. In other words, the microwave oven doesn't require any counter space. This is perfect for small, compact kitchens.