What is the electromagnetic spectrum?

The visible part of the electromagnetic spectrum is the spectrum of each colour of the light (passed through a prism) that have different wavelengths and frequencies. The order of the spectrum is red, orange, yellow, green, blue, indigo, and violet. On the red end of the spectrum, the waves have a lower frequency and a longer wavelength, while on the violet end the waves have a higher frequency and shorter wavelength. But the visible part is only a fraction of the whole spectrum. The order of the whole electromagnetic spectrum is Radio, Microwaves, Infrared, then Visible light, Ultraviolet, X-rays and Gamma rays. In the spectrum, the frequency increases from radio waves to gamma rays and the wavelength decreases from radio waves to gamma rays. Additionally, the spectrum is a continuous spectrum, meaning the cut-off point between one type of wave and another is unclear.