What is microwave?

Here's some information about microwaves:

Microwaves are a form of electromagnetic radiation with wavelengths ranging from about one millimeter to one meter. They fall between infrared radiation and radio waves in the electromagnetic spectrum. Microwaves are used in a variety of applications, including:

Microwaves are generally considered safe at low levels of exposure, but high levels can cause heating of tissues, potentially leading to burns or other health problems. Regulatory agencies set limits on microwave exposure to protect public health.