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Richard Ambrose and Jonny Phillips use an infrared camera to show a microwave oven in action.

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What is Infrared Radiation? | James Webb SpaceTelescope | NASA JWST Mid Ir Video

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Visit my website at http://www.junglejoel.com - the new James Webb Space Telescope (JWST) is designed for detecting infrared radiation. This animation explains what infrared light is, and how the JWST will use it. Please rate and comment, thanks! Credit: NASA GSFC

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Electromagnetic waves are waves that can travel through outer space. Mechanical waves, unlike electromagnetic waves, require the presence of a material medium in order to transport their energy from one location to another. Sound waves are examples of mechanical waves while light waves are examples of electromagnetic waves. Electromagnetic waves are created by the vibration of an electric charge. This vibration creates a wave which has both an electric and a magnetic part.

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waves are the only type of wave that can travel through empty space.

Infrared wavelengths have just a little bit longer wavelengths then the color red on the visible electromagnetic spectrum.

Gamma waves are the most energetic type of wave in the Electromagnetic Spectrum.

Ultraviolet waves have just a little bit smaller wavelength then the color violet on the visible electromagnetic spectrum.

waves can be used for radar as well as cooking food.

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Micro waves are electromagnetic wave with a frequency in the range of 100 megahertz to 30 gigahertz (lower than infrared but higher than other radio waves).
Overview
Microwaves are a form of electromagnetic radiation with wavelengths ranging from one meter to one millimeter. Different sources define different frequency ranges as microwaves.  In all cases, microwaves include the entire SHF band (3 to 30 GHz, or 10 to 1 cm) at minimum. Frequencies in the microwave range are often referred to by their IEEE radar band designations. Microwaves travel by line-of-sight. Unlike lower frequency radio waves they do not diffract around hills, follow the earth's surface as ground waves, or reflect from the ionosphere, so terrestrial microwave communication links are limited by the visual horizon to about 40 miles (64 km)
Uses

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Radio waves are a type of electromagnetic radiation with wavelengths in the electromagnetic spectrum longer than infrared light.
Uses
The prime purpose of radio is to convey information from one place to another through the intervening media without wires. Besides being used for transmitting sound and television signals, radio is used for the transmission of data in coded form. Long-range radio signals allow astronauts to communicate with the earth from the moon and carry information from space probes as they travel to distant planets. For navigation of ships and aircraft the radio range, radio compass, and radio time signals are constantly used.
History
The term radio comes from the Latin word Radius, which means the spoke of a wheel beam, or a beam of light or ray. Radio systems used for communication have the following parts. With more than 100 years of development, each process is categorized by a wide range of methods, specialized for different communications purposes.

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In physics, Frequency is the number of crests of a wave that move past a given point in a given unit of time. The most common unit of frequency is the hertz (Hz).

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Interference is the process in which two or more light, sound, or electromagnetic waves of the same frequency combine to reinforce or cancel each other, the amplitude of the resulting wave being equal to the sum of the amplitudes of the combining waves.
Overview
Infrared radiation is a type of electromagnetic radiation, as are radio waves, ultraviolet radiation, X-rays and microwaves. light is the part of the EM spectrum that people encounter most in everyday life, although much of it goes unnoticed. It is invisible to human eyes, but people can feel it as heat. IR radiation is one of the three ways heat is transferred from one place to another, the other two being convection and conduction. Everything with a temperature above about 5 degrees Kelvin gives off IR radiation. The sun gives off half of its total energy as IR, and much of its visible light is absorbed and re-emitted as IR, according to the University of Tennessee. Electromagnetic radiation is transmitted in waves or particles at different wavelengths and frequencies. This broad range of wavelengths is known as the electromagnetic spectrum. The spectrum is generally divided into seven regions in order of decreasing wavelength and increasing energy and frequency.
History
British astronomer William Herschel discovered infrared light in 1800, according to NASA. In an experiment to measure the difference in temperature between the colors in the visible spectrum, he placed thermometers in the path of light within each color of the visible spectrum. He observed an increase in temperature from blue to red, including an even warmer temperature measurement just beyond the red end of the visible spectrum.

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Visible Light Visible light is a form of electromagnetic radiation, as are radio waves, infrared radiation, ultraviolet radiation, X-rays and microwaves.
Overview
Visible light is a form of electromagnetic  radiation, as are radio waves, infrared radiation, ultraviolet radiation, X-rays and microwaves. Generally, visible light is defined as the wavelengths that are visible to most human eyes.  EM radiation is transmitted in waves or particles at different wavelengths and frequencies. This broad range of wavelengths is known as the electromagnetic spectrum.
Uses
The color of hot objects, such as stars, can be used to estimate their temperatures, according to IDEA. For example, the sun's surface temperature is about 5,800 Kelvin (9,980 F or 5,527 C). The light emitted has a peak wavelength of about 550 nm, which we perceive as visible white light (or slightly yellowish). According to NASA, if the sun's surface temperature were cooler, about 3,000 C, it would look reddish, like the star Betelgeuse. If it were hotter, about 12,000 C, it would look blue, like the star Rigel. Astronomers can also determine what objects are made of because each element absorbs light at specific wavelengths, called an absorption spectrum. By knowing the absorption spectra of elements, astronomers can use spectroscopes to determine the chemical composition of stars, dust clouds and other distant objects.

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Ultraviolet light is a form of radiation which is not visible to the human eye. It's in an invisible part of the electromagnetic spectrum. Radiated energy, or radiation, is given off by many objects.
So the best way to put it
Ultraviolet light is a form of radiation which is not visible to the human eye. It's in an invisible part of the "electromagnetic spectrum". Radiated energy, or radiation

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A Gamma ray is a stream of high-energy electromagnetic radiation given off by an atomic nucleus undergoing radioactive decay. Because the wavelengths of gamma rays are shorter than those of x-rays, gamma rays have greater energy and penetrating power than x-rays.

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A relatively high-energy photon with wavelength in the approximate range from 0.01 to 10 nanometers. (Also called roentgen ray)