The photon has no mass and no charge . This means that it has to be pure energy and always be travelling at the speed of light. The photon is a boson and the force carrier particle of the electromagnetic force. Depending on how the photon was created, we can see it as light, feel it as heat, hear it on the radio, use it for x-ray screens, etc.

More about photons on the main page.

About Photon in German. (Photon)