A microwave oven  - that revolutionized food preparation since  the 1970s. -- is a kitchen appliance employing microwave radiation to cook or heat food.

Consumer microwaves typically come in  Compact Microwave-  small or portable,  -- is the smallest type of typically available consumer microwave. Compacts are the most popular size of microwave oven.  primarily used for reheating food and making microwave meals and popcorn.
Medium Capacity Microwave are the standard "family" sized microwave. They cook marginally faster and can accommodate small square casseroles , They are suitable for cooking vegetables , meat and large frozen entrees.
Large Capacity- cook tall items like roasts or turkey breast, and have a large number of "auto-cook" and precise temperature control measures.
Built In microwaves are ovens that are built into the cabinetry similar to traditional ovens. and Some  are combined with an exhaust fan for installation above a cooktop.
. Counter Top microwaves , designed to sit on a counter or table., dominate the market..
More and more microwaves are sold with additional features including  convection cooking, "top browning" elements that will brown food and even rotisseries in the oven. Most microwaves have white enamel interiors but high end models are often stainless steel, like the original Radarange.