What is the relationship between light and electromagnetism?

[SilverMountai]

So how is light related to EM-ism?
I can understand its relation to heat and materia to a certain extent.
But overall the magnetic field does not have any effect on a common ray of light.
And i cannot magnetise ,for example, a piece of iron just by showering it with a light of a certain colour.
So where does the notion that its electromagnetic come from?

 

[mathman]

The basic idea is that there is a full range of electromagnetic energies, depending on frequency, including radio, infra-red, visible light, ultra-violet, x-ray, gamma ray.

http://en.wikipedia.org/wiki/Electromagnetic_radiation

 

[mfb]

And i cannot magnetise ,for example, a piece of iron just by showering it with a light of a certain colour.

Yes you can. Maybe not iron, but spins in manganese: Source.

In addition, the reflection of light can depend on the magnetization of the material: Kerr effect
You can shift the polarization with magnetic fields: Faraday effect
Or use the polarization to induce magnetic fields: Inverse Faraday effect

You can use intense laser beams to accelerate electrons in a nearly-classical way, using the electric field component of the beam.

It this enough electro-magnetic interaction? ;)