The electromagnetic spectrum covers all types of light. The difference between the types of light is the wavelength. Speed remains the same for all types of light.
Radio waves have the longest wavelength (10^3 meters). These are the size of buildings. Microwaves have a wavelength of 10^-2, roughly the size of a butterfly. Infrared waves have a wavelength of 10^-5, which is the size of a needle point.
The visible region of the electromagnetic spectrum represents the portion that can be seen with the human eye. It covers all of the colors of the rainbow. The wavelength for the visible region is 0.5×10^-6 meters, which is around the size of a protozoan.
Ultraviolet waves have a wavelength of 10^-8, which is the size of molecules. X rays have a wavelength of 10^-10, which is the size of atoms. Gamma waves are the smallest with a wavelength of 10^-12, which is the size of an atomic nucleus.
On the electromagnetic spectrum pictured, wavelength decreases from left to right.
Frequency represents the number of waves that pass a particular point in a second, measured in Hertz. Frequency and wavelength are inversely proportional. Frequence increases from left to right on the electromagnetic spectrum pictured here.
This picture was provided by Inductiveload via Wikimedia Commons.