Elementary particles, according to the standard model of particle physics, are not made of anything smaller and are fundamental components of matter. Light is also classified as an elementary particle, specifically a photon, and does not consist of smaller constituents. The concept of energy is complex; it is not an independent entity but rather a property associated with particles like photons and electrons. Energy cannot exist in isolation, as it always relates to other particles or systems. Ultimately, the nature of energy remains elusive, as it is not a tangible substance.
