Question

what is radiation? simple answer.

Answer 1

Hi mates here is your answer
Radiation is a powerful and very dangerous rays that are sent out from certain substances. You cannot see or feel radiation but it can cause serious illness or death.
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Answer 2

In physics, radiation is the emission or transmission of energy in the form of wavesor particles through space or through a material medium.

This includes:

electromagnetic radiation, such as radio waves, microwaves, infrared, visible light, ultraviolet, x-rays, and gamma radiation (γ)

particle radiation, such as alpha radiation (α), beta radiation (β), and neutron radiation(particles of non-zero rest energy)

acoustic radiation, such as ultrasound, sound, and seismic waves (dependent on a physical transmission medium)

gravitational radiation, radiation that takes the form of gravitational waves, or ripples in the curvature of spacetime.