Basic question about radiation

Hi,

Total physics layman here, but hoping someone can spare a second to
clear up some areas that are a bit vague to me. VERY simple for you
guys :-)

What is radiation?
I know light is radiation, as are X-rays, gamma rays etc etc. These are
all part of the electromagnetic spectrum, so they are electromagnetic
radiation?

But are there other kinds of radiation?
How is heat radiated for example? Vague memories of high school physics
seem to tell me that the inside of a thermos flask is silvered to
reflect radiated heat, which would seem to indicate it is similar to
light above.

Are all kinds of radiation massless?

Hmmm, but radiative isotopes radiate particles as they decay so that
cannot be right.

Can someone help my ignorant wallowing! :-)

Thanks,
Lister

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