Which Electromagnetic wave is the most useful? Explain why.

Question

nincompoop · Answer

I would say radio wave and infrared are both useful in the same degree. 
hint: communications and cooking

anonymous · Answer

Electromagnetic radiation - 
gives us the heat from the sun so we exist, 
it gives us all the knowledge about the universe that we claim to have, 
thats how we see
all our technological communication is based on electromagnetic carrier waves
and so on

aravindg · Answer

Microwaves are also very useful .Infact each electromagnetic wave is useful in its own way

nincompoop · Answer

electromagnetic wave = comprises all the different waves in the light spectrum

GammaXRayuVVIBGYORiRmWRadio
@aravind the question being asked is which of the following is the most useful. though I accept the first part of your answer, I am sort of lost to the second part.