The concept of the graviton is actually associated with a theory known as quantum gravity, which aims to reconcile general relativity (describing gravity on a macroscopic scale) with quantum mechanics (describing fundamental particles and their interactions on a microscopic scale). In quantum gravity, the graviton is a hypothetical elementary particle that mediates the force of gravity, similar to how photons mediate the electromagnetic force.
However, it's important to note that the graviton is still a purely theoretical construct, and its existence has not been confirmed experimentally. Currently, there is no experimental evidence for the existence of gravitons, and developing a complete and consistent theory of quantum gravity remains an open challenge in physics.
General relativity, on the other hand, is a highly successful theory that describes gravity as the curvature of spacetime caused by mass and energy. It provides a framework for understanding the behavior of massive objects, the dynamics of the universe, and phenomena like black holes and gravitational waves. General relativity has been extensively tested and confirmed in various experimental and observational contexts, such as the bending of light around massive objects and the precise predictions of the gravitational redshift.
While the discovery of the graviton would be a significant milestone for a complete theory of quantum gravity, it is not a necessary prerequisite for understanding or using general relativity. General relativity stands on its own as a powerful and accurate theory of gravity, even in the absence of a fully developed theory of quantum gravity.