Sunlight is radiation

LIGHT is radiation, from radio (30-300Ghz), to LTE (~25MHz), to 5G (~450MHz - 6GHz), visible light (405-790THz), to ultraviolet (~1000THz), to x-rays(30PHz - 30EHz), to gamma rays. It's all electromagnetic radiation.

The frequency is related to energy, and inversely related to wavelength. The higher the frequency, the lower the wavelength, and the higher the energy.

Ultraviolet light has a high enough energy to be ionizing, this means it can knock electrons off of atoms. This means that stuff exposed to it will slowly be broken down at a molecular level over time. And in the case of many dyes, the pigments break down rather easily.

This also applies to your skin, a sunburn isn't really a burn as much as it is your cells self-destructing due to DNA damage from ultraviolet light.

Fun fact the people that are upset about 5G being dangerous have a fundamental misunderstanding about how light works Just look at the frequencies I listed at the beginning of this post. 450 megahertz is 5G, visible light STARTS at ~400 terahertz... And that's not even close to being ionizing.