Electromagnetic energy is not the only type of energy that contains a particle; photons are specific to electromagnetic interactions. Heat is identified as a form of kinetic energy, while electromagnetic energy is associated with potential energy in fields. There are four fundamental forces in nature, each linked to specific particles, with gravity's graviton still unconfirmed. Energy is a property of various entities, including electromagnetic fields and particles, rather than an object itself. The concept of heat varies based on context, relating to sensations or the kinetic energy of molecules.