P2

Light is a type of electromagnetic radiation (EM radiation)

Radiation is just a transfer energy e.g. sunlight is a transfer of energy from the Sun to the Earth

Visible light (the colours of the rainbow, from red to violet it is just radiation that our eyes can detect. Radiation thats further along in the 'red' direction is called infared. Similarly, radiation thats further along in the 'violet' direction is called ultraviolet 

There are seven types of radiation altogether, making up the electromagnetic spectrum 

You feel the warmth of the sun through heat energy by infared radiation

The energy is delivered as photons, a photon is a tiny 'droplet' or 'packet' of energy