In quantum field theories, interactions are exerted by the exchange of a force carrier particle. For the electromagnetic force, this is the photon, for the strong force, the gluon and for the weak force, the W and Z bosons. All these force carrying particles have been observed.
Now it is imagined, that if we are able to find a quantized version of gravity, it would also be described by a quantum gauge field theory. Then the force would be exchanged by a messenger particle as well. This messenger particle is the graviton. It has spin 2. We haven't observed this particle yet.
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