Radiatio electromagnetica in genera varia, secundum undae [[frequentia]]m, classificatur; haec genera, ex ordine frequentia undae augente, longitudine autem decrescente, sunt:
* [[unda radioelectrica|undae radioelectricae]],
* [[unda radiophonica|undae radiophonicae]],
* [[unda micrometrica|undae micrometricae]],
* [[radiatio terahertziana]],
* [[radiatio infrarubra]],
* [[spectrum visuale|lux visibilis]],
* [[radiatio ultraviolacea]],
* [[radiatio Roentgensis]], et
* [[radiatio gamma]].
Electromagnetic radiation (sometimes abbreviated EMR) is a ubiquitous phenomenon that takes the form of self-propagating waves in a vacuum or in matter. It consists of electric and magnetic field components which oscillate in phase perpendicular to each other and perpendicular to the direction of energy propagation. Electromagnetic radiation is classified into several types according to the frequency of its wave; these types include (in order of increasing frequency and decreasing wavelength): radio waves, microwaves, terahertz radiation, infrared radiation, visible light, ultraviolet radiation, X-rays and gamma rays. A small and somewhat variable window of frequencies is sensed by the eyes of various organisms; this is what we call the visible spectrum, or light.