Electromagnetic radiation is the transfer of energy by electromagnetic waves. Basically it is the movement of waves from one place to another.
For example: X rays and Gamma rays. In order to transfer energy Electromagnetic Radiation act on the particular stuff to cause of initiate the chemical reactions. It can break bonds by exceeding the activation energy. They can break or make bonds.
For example: the microwave oven transferring energy for making pop corns. Also the light rays causing the reaction on the retina. The colors and everything else is an example. The energy carried is called Radiant energy.
The Energy in electromagnetic waves are half due to electric field and half due to magnetic field. Electromagnetic radiation is the transfer of energy by electromagnetic waves. Basically it is the movement of waves from one place to another.