The light is part of a small range of electromagnetic vibrations found in the electromagnetic spectrum.
The Earth's atmosphere allows only a small part of this radiation.
Short waves are absorbed in the atmospheric layers and long waves are reflected.
Most waves that reach us are those of visible light.
The spectrum of visible light ranging from infrared to ultraviolet, corresponds to wavelengths of 400 nanometers in the violet to 800 nanometers in the red, i.e. 4 x 10-7 to 8 x 10-7 meters. Between the wavelength (λ) and frequency (ν) is the following relationship: ν = c / λ (c is the speed of light is about 300,000 km/s). Electromagnetic spectrum includes all light windows.
Maxwell has determined that light is an electromagnetic wave and there is no reason to limit the wavelength of the latter to the interval corresponding to the spectrum of visible light, the spectrum is light.
The nature of light is quantum mechanics for which it is both a wave and a particle.