A filter that absorbs ultraviolet light. Used to remove ultraviolet haze and improves the contrast of a distant scene, particularly at high altitudes where UV light is more apparent.

Electromagnetic radiation, having a wavelength in the range 3,800 - 100 angstrom units, found in the electromagnetic spectrum just beyond the violet end of the visible spectrum. Although invisible to the eye most sensors and films are sensitive to it.

To transfer computer files to a less local or more significant location ie from a personal computer to a server.