The nature of gravity and its relation to particles is an area of active scientific research and theoretical exploration. Gravitons are hypothetical particles that are postulated in certain theories, such as quantum gravity, to mediate the force of gravity. According to these theories, similar to how photons mediate the electromagnetic force, gravitons would carry the gravitational force between particles.
However, it's important to note that gravitons are purely theoretical at this point, and their existence has not been experimentally confirmed. The current understanding of gravity is described by Albert Einstein's general theory of relativity, where gravity is considered as the curvature of spacetime caused by the presence of matter and energy. In this framework, gravity is not viewed as a separate particle, but rather as a property of matter and energy that affects the curvature of spacetime.
To reconcile general relativity with quantum mechanics, which describes the behavior of particles and forces on a very small scale, physicists are actively exploring the development of a theory of quantum gravity. Gravitons are a concept that emerges in some of these theoretical frameworks, suggesting that gravity could be quantized and mediated by particles. However, more research and experimental evidence are needed to confirm the existence of gravitons and understand the fundamental nature of gravity at the quantum level.