👉 Microwaves are a type of radio wave that travels at very low frequencies, typically less than 300 gigahertz (GHz). They have been used for centuries in agriculture and medical applications to heat food and water. Microwaves can also be used in the production of light-emitting diodes (LEDs) or as an energy source in various devices such as microwave ovens, fridges, and heaters. The term "microwaves" is often associated with the technology