Microwave oven..
The microwave was invented by Percy Spencer, who worked for a company called Raytheon, a manufacturer of radar devices, and the microwave invention came in 1945.
In my opinion it's an important device in every house, it is used to heat food, or to boil water, or dissolve frozen meat in just minutes, the microwave oven was invented at the end of the Second World War, at first the microwave was very large and expensive, people did not trust it because of the radiation in which it is used, and in the end, the technology improved and fears faded, and the microwave is now used in every house