The problem with food is that it eventually does lose its latent heat and becomes cold and stale. It is thought the best to heat food before consuming it. Warm food gives a distinct flavor over cold food. You can easily warm food over the flaming stove in the kitchen like you did when you prepared your meals. Alternatively, you could use a microwave oven to warm your food. These typical ovens stepped into our lives to make our lives easier by simplifying the cooking process for some dishes and enabling to serve the food in a fresh and hot condition.
The trick in microwave ovens lies in the fact that these ovens omit certain waves that are capable of vibrating the molecules of food products we keep in them. This way, some heat is produced in the vibration process, and it heats up the food. Because the process involves only the vibrations of the molecules of food products and has absolutely nothing to do with the container or its the material from which it is made, the container emerges out of the oven as it is. The ideal materials of the containers used in microwaves are glass, ceramic and paper. These materials are penetratiable by the microwaves let out by the oven, so they eventually reach the food particles.
The waves created in the process are reflected by the walls of the oven as the walls are made of metal facades. This way, the waves produced in the oven are made to bounce again and again inside the oven. They pass through the food material in the process, and end up heating it.
Using microwave ovens is typically bereft of all dangers of exposure to radiation that causes cancer. They employ non-ionizable radiations.