The Universe is a Multi-Matter Multi-Dynamic Space. The matter that constitute it are in a mass-energy equivalence state and so possess the capacity to do work (realized action of force).
This equivalence is sumarized by the Eistein Equation, E = mc2 (E is energy, m is mass and c is the velocity of light) and can be broadly grouped as follows:
(a) Mass-energy equivalence that move with velocities less than the velocity of light.
(b) Mass-energy equivalence that moves with the velocity of light.
The energy associated with (b) is called radiant energy. A mass-energy equivalence at rest has potential energy (P.E) and kinetic energy (K.E) during motion. K.E = (1/2)mv2 in the case of (a). K.E = electromagnetic radiation in the case of (b). The conversion of P.E to K.E or from K.E to P.E, is one of the most common energy conversions.
All other forms of energies are different expressions of P.E or K.E.