This energy, however, arrives at a receiver not continuously but in discrete units called photons . The energy transported by an electromagnetic wave is not continuously distributed over the wavefront. It is transported in discrete packages. In addition to its wave properties, light also has particle nature. Photons are the particles of light.
Photons are electrically neutral.
Js is a universal constant called Planck's constant . The energy of each photon is inversely proportional to the wavelength of the associated EM wave. The shorter the wavelength, the more energetic is the photon, the longer the wavelength, the less energetic is the photon. A laser beam and a microwave beam can carry the same amount of energy. In this case the laser beam contains a smaller number of photons, but each photon in the laser beam has a higher energy than the photons in the microwave beam.