What is the purpose of the microwave oven?

The microwave oven is used to heat or cook foods quickly and efficiently. It is effective at heating anything with a high water content, so reheating drinks is a snap. The oven itself doesn't need to "warm up" to be effective, and many cups, bowls and plates can be put into the oven and used immediately upon removing them. A microwave oven also provides an unmatched level of convenience, and this is probably one of the supreme advantages of having this appliance handy.