How does a Microwave work?

Well this might sound very basic but I just came to know how does a microwave works. I know that there were microwave involved but didn't knew it completely. But here is what I came to know. I got it from this link .

Microwaves are a form of electromagnetic energy , like light wave or radio wave and occupy a part of the electromagnetic spectrum. Microwaves cause food molecules to vibrate rapidly, creating friction that produces heat which then cooks the food. In other words, food cooked in a microwave simply absorbs microwave and turns their energy into thermal energy, which cooks the food. Microwaves are colorless, odorless, tasteless, and these are not radioactive. Microwave oven is one of the most energy efficient appliances money can buy today. For example, it takes 18 times the electricity to bake a potato in a regular oven than in a microwave. Microwaves cook from the outside towards the center of the food. Microwave ovens are faster for most cooking jobs because the energy heats the food and not the oven or the containers. They don't also heat up the kitchen, especially in the summer time like the other cooking appliances. All credit goes to the author of the article here